Baumgartner, Wilfrid S.
Paris , International Chamber of Commerce
Buku Teks
[edited by] S. Prakash Sethi, Jagdish N. Sheth
Goodyear, 1973
Buku Teks
Prasad, S. Benjamin
Prentice-Hall, 1976
Buku Teks
Kline, John M., author
Quorum Books, 1985
Buku Teks
Sethi, S. Prakash, author
Goodyear, 1973
Buku Teks