Pritchard, Peter.,
Oxford University Press, 1994
Buku Teks
Viemeister, Peter E.
Doubleday, 1961
Buku Teks
Freuchen, Peter
Messner, 1957
Buku Teks
Ur, Penny
Cambridge University Press, 1999
Buku Referensi
Ayer, Alfred Jules, 1910-1989
Penguin Books, 1980
Buku Teks