O`Hair, Dan, author
Kencana, 2009
Buku Teks
Beck, Charles E., author
Prentice-Hall, 1999
Buku Teks
O`Hair, Dan, author
Allyn and Bacon, 2011
Buku Teks
Schneider, Arnold E., author
McGraw-Hill, 1975
Buku Teks
Jackson, Peter C., author
Pitman, 1987
Buku Teks