Manullang, M., author
Liberty, 1985
Buku Teks
Esther Dumaria, author
2003
UI - Tesis (Membership)
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1993
UI - Skripsi (Membership)
Harnanto, author
BPFE , 1987
Buku Teks
S. Munawir, author
Liberty, 1995
Buku Teks