Safri Ayat, author
Erlangga, 1996
Buku Referensi
Mehr, Robert I., author
Balai Pustaka, 1982
Buku Teks
Chaplin, J. P., author
RajaGrafindo Persada, 2006
Buku Referensi
Chaplin, J.P., author
Rajawali, 2011
Buku Referensi
Ingrisano, John R., author
Chicago, Dearborn Financial Publishing, 1990
Buku Referensi