Darwin Press , 1972
Buku Teks
N.J. The Darwin Press , 1986
Buku Teks
editor, H. Igor Ansoff
Penguin, 1969
Buku Teks
George Allen & Unwin Ltd, 1951
Buku Teks
[edited by] S. Prakash Sethi, Jagdish N. Sheth
Goodyear, 1973
Buku Teks
Hunt, James H., author
McGraw-Hill, 1980
Buku Teks