Astaria Widiati
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2002
UI - Skripsi Membership
Drew, Clifford J.
A Bell & Howell Company, 1986
Buku Teks SO
Kaluza, Henry J.
McGraw-Hill/Ryerson, 1976
Buku Teks
Woltz, Phebe M.
McGraw-Hill, 1983
Buku Teks
Bedford, Norton M.
John Wiley, 1979
Buku Teks