Large, Stephen S.
Routledge, 1992
Buku Teks
Moser, Charles A., author
Caroline House, 1979
Buku Teks
Chi, Hsin
Cosmos Books, 1978
Buku Teks
Paridah Abd. Samad, author
Affluent Master, 1998
Buku Teks
International Society for Educational Information
ISEI, 1987
Buku Teks