Howard, John A., author
Richard D. Irwin, 1962
Buku Teks
Howard, John A., author
Richard D. Irwin, 1973
Buku Teks
Howard, John A., author
Richard D. Irwin, 1957
Buku Teks
Brown, F.E.
Addison Wesley c. , 1980
Buku Teks
Kotler, Philip, author
Holt, Rinehart and Winston , 1971
Buku Teks