Lippincott Williams & Wilkins , 2007
Buku Referensi
Armand Arief Sim, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2009
UI - Skripsi (Open)
by oris L. Carnevali [and others]
J.B. Lippincott , 1984
Buku Teks
Niven, Paul, author
Elekmedia Computindo, 2005
Buku Teks
Forbes, Betty A.
Mosby Elsevier, 2007
Buku Teks