J. Winardi, author
Kencana Prenada Media, 2004
Buku Teks
J. Winardi, author
Kencana Prenada Media, 2015
Buku Teks
edited by Calvin A. Kent, Donald L. Sexton and Karl H. Vesper
Prentice Hall, 1982
Buku Referensi
Hisrich, Robert D., author
McGraw-Hill, 2014
Buku Teks
Hisrich, Robert D., author
McGraw-Hill Education, 2013
Buku Teks