Zaidan, George C., author
The John Hopkins University Press, 1971
Buku Teks
American Management Association , 1986
Buku Teks
Helyar, Frank W.
McGraw-Hill, 1978
Buku Teks
Konkel, James H., author
McGraw-Hill, 1987
Buku Teks
Clark, John E.
McGraw-HIll, 1983
Buku Teks