Still, Richard R
Prentice Hall International, 1988
Buku Teks
Jones, John G., author
Alexander Hamilton Institute, 1961
Buku Teks
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1994
UI - Skripsi (Membership)
Stanton, William J., author
Richard D. Irwin, 1978
Buku Teks
Stanton, William J., author
Richard D. Irwin, 1964
Buku Teks