Wight, James K., author
[publisher not identified], [date of publication not identified]
Buku Teks
Balaguru, Perumalsamy N., author
Taylor &Fransic, 2009
Buku Teks
McCormac, Jack C., author
Erlangga, 2004
Buku Teks
Barker, Roger A., author
Psychology Press, 1999
Buku Teks
Buku Teks