Bolleau, Janet
APA Publications (HK) , 1991
Buku Teks
Weaver, David
John Wiley & Sons, 2014
Buku Teks
edited by Grahame Johnston
Oxford University Press, 1980
Buku Referensi
by Johnny Allen [and others]
John Wiley & Sons, 2008
Buku Teks
Nadjamuddin Ramly
Grafindo Khazanah Ilmu, 2007
Buku Teks