Keegan, Warren J.
Alex Media Komputindo, 1992
Buku Teks SO
Keegan, Warren J.
Prehallindo , 1995
Buku Teks
Keegan, Warren J.
Alex Media Komputindo, 1992
Buku Teks SO
Kotler, Philip
Erlangga, 2009
Buku Teks SO
Keegan, Warren J.
Prenhallindo, 1996
Buku Teks