Cammack, Paul Anthony
Macmillan, 1993
Buku Teks SO
Princeton University Press, 1980
Buku Teks SO
Norbu, Dawa
Routledge, 1995
Buku Teks SO
edited by Chandra Talpade Mohanty, Ann Russo, Lourdes Torres
Indiana University Press, 1991
Buku Teks
edited by Michael Pacione
Springer Helen, 1981
Buku Teks SO