edited by Calvin A. Kent, Donald L. Sexton and Karl H. Vesper
Prentice Hall, 1982
Buku Referensi
J. Winardi
Kencana Prenada Media, 2004
Buku Teks SO
J. Winardi
Kencana Prenada Media, 2015
Buku Teks SO
Birley, Sue
Financial Times Prentice Hall, 2000
Buku Teks SO
Birley, Sue
Financial Times Prentice Hall, 2000
Buku Teks SO