Culey, Ray T., author
South-Western Publishing, 1953
Buku Teks
Le, Chap T., author
Wiley, 2010
Buku Teks
Ackoff, Russell Lincoln, 1919-, author
John Wiley & Sons, 1962
Buku Teks
Chako, George K
North-Holland, 1976
Buku Teks
Chako, George K
North-Holland, 1976
Buku Teks