Martyn, Howe, author
Lexington Books, 1972
Buku Teks
Shapiro, Alan C., author
Allyn and Bacon, 1989
Buku Teks
Shapiro, Alan C., author
Allyn and Bacon, 1992
Buku Teks
Sethi, S. Prakash, author
Goodyear, 1973
Buku Teks
Manser, W.A.P.
Cassell/Associated Business Programmes, 1973
Buku Teks