Oxford University Press, 1993
Buku Teks
Buono, Anthony F.
Jossey-Bass, 1989
Buku Teks
edited by Tim O`Riordan and Jill Jager
Routledge, 1996
Buku Teks
Jackson, Susan E.
South Westh Western College, 2000
Buku Teks
Rijken, Conny
T.M.c. Asser Press, 2003
Buku Teks