Bengtson, J.D., 1994, "Edward Sapir and the "Sino-Dene" hypothesis", Anthropological Science 102, 1994-3, 207-230. Gako-hitzak: Kidetasunak [Hizkuntz -]; Sapir, Edward (hizkuntzalaritza, teoria)
Bengtson, J.D., 1994, "On the genetic classification of Basque", Mother Tongue. Newsletter of the Association for the Study of Language In Prehistory 22, 1994, 31-36. Gako-hitzak: Sailkapena [Hizkuntzen -]