Straus, Jane
Jossey-Bass, 2008
Buku Teks
Langan, John, 1942-, author
McGraw-Hill, 2013
Buku Teks
Kaplan, Jeffrey P., author
Prentice Hall International, 1995
Buku Teks
Murphy, Raymond, author
Cambridge University Press, 1998
Buku Teks
Shurter, Robert L.
McGraw-Hill, 1959
Buku Teks