Patrick, Gay D., author
Neal-Schuman, 1992
Buku Referensi
Jolson, Marvin A., author
Dunellen , 1970
Buku Teks
Weingand, Darlene E., author
Libraries Unlimited, 1999
Buku Teks
Kotler, Philip, author
McGraw-Hill, 2007
Buku Teks
Feynman, Richard Phillips
Norton , 1988
Buku Teks