Messing, Bob
Pustaka Binaman Pressindo, 1996
Buku Teks
Manullang, M., author
Gajah Mada University Press, 2002
Buku Teks
Waworuntu, Tony, author
Gramedia Pustaka Utama, 1995
Buku Teks
Manullang, M., author
Ghalia Indonesia, 1977
Buku Teks
Heidjrachman Ranupandojo, author
Yogyakarta: BPFE, c1987
Buku Teks