Hutahaean, Christian, author
Fakultas Teknik Universitas Indonesia, 2003
UI - Skripsi (Membership)
Barden, William Jr., author
Howard W. Sams & Co., 1978
Buku Referensi
[Universitas Indonesia, ], 2006
UI - Skripsi (Membership)
Spracklen, Kathe, author
Hayden Books, 1979
Buku Teks
Fakultas Psikologi Universitas Indonesia, 2004
UI - Tesis (Membership)