Sinnakkannu, Jothee, author
Lexis lexis, 2014
Buku Teks
Parker, Lee D., author
Prentice-Hall, 1989
Buku Teks
Crandell, Thomas L.
McGraw-Hill, Higher Education, 2009
Buku Teks
Zanden, James W. Vander, author
McGraw-Hill, 1993
Buku Teks
Papalia, Diane E., author
McGraw-Hill, 1992
Buku Teks