Coleman, James S., author
University of California Press, 1958
Buku Teks
edited by Stephen Barbour and Cathie Carmichael
Oxford University Press, 2000
Buku Teks
Mclachlan, Noel
Penguin Book, 1989
Buku Teks
Norbu, Dawa
Routledge, 1995
Buku Teks
Storry, Richard, 1913-1982, author
Greenwood Press,, 1957
Buku Teks