Howard, John A., author
Richard D. Irwin, 1957
Buku Teks
Howard, John A., author
Richard D. Irwin, 1962
Buku Teks
Keller, kotler, author
Pearson Education, Inc, 2006
Buku Teks
Mullins, John W., author
McGraw-Hill , 2013
Buku Teks
Keegan, Warren J., author
Prentice Hall of India, 1982
Buku Teks