Universitas Indonesia, 2010
UI - Tugas Akhir
Baldwin, William Lee, author
Richard D. Irwin, 1987
Buku Teks
Fellner, William, 1905-, author
Alfred A. Knopf, 1949
Buku Teks
Hutagalung, Maringan, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2012
UI - Skripsi (Open)
Shubik, Martin
John Wiley & Sons, 1960
Buku Teks