Kotler, Philip, author
Prentice Hall International, 1983
Buku Teks
Buskirk, Richard Hobart, 1927-, author
Holt Rinehart, 1961
Buku Teks
Buskirk, Richard Hobart, 1927-, author
Holt Rinehart, 1970
Buku Teks
Ryan, William T
Richard D. Irwin, 1980
Buku Teks
Dennis Adcock, Ray Bradfield, Al Halborg, Caroline Ross
Pitman Pub, 1993
Buku Referensi