Fletcher, Shirley, author
Gramedia, 2005
Buku Teks
Fletcher, Shirley, author
Bhuana Ilmu Populer, 2005
Buku Teks
Vania G.Wibisono, author
2001
UI - Skripsi (Membership)
Chen, Chris, author
McGraw-HIll , 2005
Buku Teks
Fakultas Psikologi Universitas Indonesia, 2004
UI - Tesis (Membership)