edited by G. Alexander and O.B. Williams
Sydney University Press, 1973
Buku Teks
Gifford, Terry, author
Routledge, 1999
Buku Teks
Mildred Elizabeth Aldridge, author
Seameo Biotrop, 2019
Artikel Jurnal
Roth, Philip, author
Vintage International, 1997
Buku Teks
Westview Press, 1986
Buku Teks