"The Vinland Map controversy and the discovery of a second version of the Tartar Relation : the authenticity of the 1339 text", Gregory G. Guzman, "Terrae Incognitae", R: XXXVIII, 2006 : [recenzja]

Studia Źródłoznawcze. Commentationes, Tom 46 (2008) s. 194-195
Jerzy Strzelczyk , Gregory G. Guzman (aut. dzieła rec.)