Jabarkan Hervarar saga: see Tolkien dari Sigafridus

Historia Norvegie: Latin text in Monumenta Historica Norvegiae (1880), pp. 69–124; text and English translation in Ekrem, Mortensen & Fisher 2003.

Johansson, Hilding (1986) 'Skara som stiftstad', in Sträng 1986, pp. 387–410.

King-lists of Sweden: Scriptores Rerum Suecicarum Medii Aevi vol. I,  pp. 1–15

Kjöllerström, Sven (1979) Sankt Sigfrid, Sigfridslegenden och Växjö Stift (Lecture given at the Kyrkohistoriska föreningens ärsmöte, Uppsala, April 1979 and at the 500th anniversary of the University of Copenhagen, May 1979.

Knibbs (2011), Anskar, Rimbert and the Forged Foundations of Hamburg-Bremen (Farnham)

Liber Eliensis: Latin text ed. E.O. Blake 1962 (Royal Historical Society: Camden third series, volume 92, London); English translation by Janet Fairweather 2005, Liber Eliensis: a History of the Isle of Ely from the seventh century to the twelfth (Woodbridge).

Lager, Linn (2003), 'Runestones and the Conversion of Sweden' in Carver 2003, pp. 497–507.

Larsson Lars-Olof (1931), Det medeltida Värend (Diss. Lund).

Malmer, Brita (1989), The Sigtuna Coinage c. 995-1005 (Commentationes de nummis saeculorum IX-XI in Suecia repertis, nova series 4, Stockholm & London.

Malmer, Brita 1997, The Anglo-Scandinavian Coinage, c. 995-1026 (Commentationes de nummis saeculorum IX-XI repertis, nova series 9 (Stockholm & London)

Monumenta Historica Norvegiae: Latinske kildeskrifter til Norges historie in Middelaldern ed. G. Strom (Kristiania 1880)

Niblaeus, Erik G. (2010) German Influence on religious practice in Scandinavia c. 1050 - 1150, King's College, London, diss.

Norton, Christopher (2004), 'York Minster in the time of Wulfstan', in Townend 2004, pp. 207–34.

Oláfs saga Tryggvasonar en mesta: 'Frá Sigurði Byskupi; Her (s(egir) af framferd Sigurdar byskups; Kapitulum': printed in Halldorsson vol III (2000) pp. 57–64; also cited in secondary sources as from Flateyjarbók.

Oppermann, C.J.A. (1937), The English Missionaries in Sweden and Finland (London)

Raine, James ed. (1874–94), Historians of the Church of York and its Archbishops (Rolls Series, vols. LXXI – LXXII London).

Rimbert, Vita Sancti Anskarii, Latin text in Waitz 1884  and Trillmich 1961 (with German translation; English translation in Robinson 1921.

Robinson, Charles H (1921), Anskar, the Apostle to the North, 801-65, translated from the Vita Anskarii by Bishop Rimbert (London)

Sawyer, Birgit (2000), The Viking Age Rune-Stones:  Custom and Commemoration in Early Medieval Scandinavia (Oxford).

Sawyer, Birgit and Sawyer, Peter (1993) Medieval Scandinavia: from Conversion to Reformation, circa 800-1500 (Minneapolis & London)

Sawyer, Birgit, Sawyer, Peter & Wood, Ian (1987), The Christianization of Scandinavia: Report of a Symposium held at Kungalv, Sweden, 4–9 August 1985 (Alingsås)

Sawyer, Peter, The Making of Sweden (1988: Occasional Papers on Medieval Topics 3 - Viktoria Bokforlag, Alingsås, in cooperation with the Department of History, Gothenburg University)

Scriptores Rerum Suecicarum Medii Aevi (Uppsala 1818-1876):

vol. I, ed. E.M. Fant (1818)

vol. II ed. E.J. Geijer & J.H. Schröder (1828)

vol. III. ed. E. Annerstadt (1871–76)

Schmeidler, Bernhard (1917) ed. Adam Bremensis,  Gesta Hammaburgensis Ecclesie Pontificum (MGH SRG vol. 2, 3rd edition).

Schmid, Toni (1931) Den Helige Sigfrid (Lund)

Schmid, Toni (1942) 'Trois légendes de Saint Sigfrid', Analecta Bollandiana 60, pp. 82–90.

Scott, John (1981) ed. & trans.William of Malmesbury, De antiquitate Glastoniensis ecclesiae (Woodbridge).

Snorri Sturluson, Óláfs saga Helga, from Heimskringla ed. Aðalbjarnarson 1941-51; English translations in Monson, E. & Smith. A.H. (Cambridge 1932); Hollander. Lee M. (Austin, Texas 1964).

Sträng, Arne (1986), Skara: Före 1700, Staden i Stiftet (Skara).

Talbot, C.H. (1954), The Anglo-Saxon Missionaries in Germany (London).

Tolkien, Christopher (1960), Hervarar saga och Heidreks konungs: the Saga of King Heidrek the Wise, translated from the Icelandic with introduction, notes, and appendices (London).

Townend, Matthew (2004) ed. Wulfstan, Archbishop of York (Proceedings of the Second Alcuin Conference: Studies in the Early Middle Ages 10: York)

Trillmich W. (1961) ed. Quellen des 9. und 11. Jahrhunderts zur Geschichte der Hamburgischen Kirche und des Reiches (Darmstadt).

Tschan F. (2002), trans. History of the Archbishops of Hamburg-Bremen, with introduction and bibliography by Timothy Reuter  (New York).

Vastovius, Ioannes (1623), Vitis Aquilonia (Cologne, 2nd edition, corrected and annotated by Erik Benzelius, Uppsala 1708).

Vretemark, Maria and Axelsson, Tony (2008), 'The Varnhem Archaeological Research Project - a new insight into the Christianisation of Västergötland', Viking and Medieval Scandinavia 4, pp. 209 – 219.

Waitz, G (1884), Vita Anskarii auctore Rimberto: accedit Vita Rimberti (MGH SRG, vol. LV:  Hannover).

William of Malmesbury, see Scott 1981.

Wordsworth, John, Bishop of Salisbury (1911), The National Church of Sweden (London, Oxford, Milwaukee)