Coba jelasin Lihat pula dari Pytheas dong

John Taylor, Albion: the earliest history" (Dublin, 2016)

Cunliffe, Barry. The Extraordinary Voyage of Pytheas the Greek. London: Allen Lane, 2001.

Roseman C. H. Pytheas of Massalia. A critical examination of the texts. Seattle: University of Washington, 1983.

Spekke, Arnolds. The ancient amber routes and the geographical discovery of the Eastern Baltic''. Stockholm: Goppers, 1957.