Dundon, Elaine, author
American Management Association, 2002
eBooks
Gulf Puslishing, 1964
Buku Teks
Kraemer, Sieverts & Partners ; English translation by James L. Ritchie
McGraw-Hill , 1977
Buku Teks
Staples, 1970
Buku Teks
Kotler, Philip, author
John Wiley & Sons, 2003
Buku Teks