the National Museum of Ethnology, 1991
Buku Referensi
Birket-Smith, Kaj, author
University of Wisconsin Press, 1965
Buku Teks
Ake, Claude
The Dorsey Press, 1967
Buku Teks
Setterwall, Ake
P.A. Norstedt & SonersForlag, 1948
Buku Teks
Barnouw, Victor, author
Dorsey Press, 1975
Buku Teks