Galloway, Lee, author
Alexander Hamilton Institute, 1914
Buku Teks
Wylie, Herry L.
Prentice-Hall, 1961
Buku Teks
American Management Association, 1953
Buku Teks
Andika Mitra Karuna, author
Universitas Indonesia, 2009
UI - Tesis (Open)
Cornell, William B., author
Alexander Hamilton Institute, 1962
Buku Teks