Liebing, Ralph W., author
John Wiley & Sons, 1999
Buku Teks
Situmeang, Boris A., author
2008
UI - Skripsi (Open)
Diah Ayu Wulandari, author
2015
UI - Skripsi (Membership)
Billings, Keith H., author
Van Nostrand Reinhold, 1993
Buku Referensi
Weidhaas, Ernest R., author
Allyn and Bacon, 1989
Buku Teks