Haarmann, Harald (2014): «Ethnicity and Language in the Ancient Mediterranean», i: McInerney, Jeremy (red.): . Chichester, UK: John Wiley & Sons, Inc. doi:10.1002/9781118834312.ch2. ISBN 9781444337341; s. 17–33. Aikio, Ante (2004): «An essay on substrate studies and the origin of Saami», i: Hyvärinen, Irma; Kallio, Petri; Korhonen, Jarmo (red.): [Etymology, loanwords and developments]. Mémoires de la Société Néophilologique de Helsinki (tysk). Bind 63. Helsinki: Société Néophilologique. ISBN 978-951-9040-19-6; s. 5–34. Häkkinen, Jaakko (2012): «Early contacts between Uralic and Yukaghir» (PDF). . Helsinki: Finno-Ugric Society (264), s. 91–101. Ringe, Don (6. january 2009): «The Linguistic Diversity of Aboriginal Europe», . Mark Liberman.