Hutajulu, Michael Binanga , author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013
UI - Skripsi (Membership)
Foster, Louis O., author
Chelton, 1961
Buku Teks
Jones, Frank H., author
W. Heffer & Sons, 1972
Buku Teks
Hawkins, David F., author
Dow Jones/Irwin, 1972
Buku Teks
Tito Baskoro, author
2017
UI - Skripsi (Membership)