Kawasaki, Guy
Portfolio/Penguin, 2011
Buku Teks
Pawakapan, Phuangthong R.
Institute of South East Asia Studies, 2013
eBooks
Smitherman, Colleen
F.A. Davis company, 1981
Buku Teks
Tedeschi, James T.
American Psychological Association , 1994
Buku Teks
edited by M. Marois
Pergamon Press, 1977
Buku Teks