Spero, Joan Edelman, author
Routledge , 1997
Buku Teks
Spero, Joan Edelman, author
Wadsworth, 2010
Buku Teks
Hodgson, John S., author
Prentice-Hall, 1983
Buku Teks
Hill, Hal, 1948-, author
ASEAN-Australia Joint Research Project, 1984
Buku Teks
Spero, Joan Edelman, author
Routledge, 1994
Buku Teks