Keegan, Warren J., author
Prenhallindo, 1996
Buku Teks
Siswanto Sutojo, author
LPPM, 1981
Buku Teks
Nijman, H. J., author
Erlangga, 1977
Buku Teks
Simamora, Bilson, author
Gramedia Pustaka Utama, 2005
Buku Teks
Angipora, Marius P., author
RajaGrafindo Persada, 1999
Buku Teks