American Society of Civil Engineers, 1998
Buku Teks
Penn, Ira A., author
Gower, 1998
Buku Teks
editor, Jerry S. Rosenbloom
Irwin, 1996
Buku Referensi
Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Pan Books, 1982
Buku Teks
Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Harper & Row, 1945
Buku Teks