Brooks/Cole, 1997
Buku Teks
Hutauruk, Kamala, author
Fakultas Teknik Universitas Indonesia, 2003
UI - Skripsi (Membership)
Windyastuti, author
1993
UI - Skripsi (Membership)
Sri Rahayu, author
Fakultas Psikologi Universitas Indonesia, 1998
UI - Skripsi (Membership)
Van Nostrand Reinhold, 1986
Buku Teks