Hery, author
Kencana, 2009
Buku Teks
Harahap, Sofyan Syafri, author
Rajawali, 2012
Buku Teks
Harahap, Sofyan Syafri, author
RajaGrafindo Persada, 1995
Buku Teks
Wahyuni Lestari, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2002
UI - Skripsi (Membership)
Tuanakotta, Theodorus M., author
LPFE-UI, 1986
Buku Teks