Jepson, R. W.
Longman , 1936
Buku Teks
Azar, Betty Schrampfer, 1941-, author
Prentice Hall Regents, 1989
Buku Referensi
Ehrlich, Eugene, author
McGraw-Hill , 2011
Buku Teks
Anderson, W.M. (Wendy M.), author
Wiley Publishing Australia Pty Ltd, 2013
Buku Teks
Azar, Betty Schrampfer, 1941-, author
Prentice Hall Regents, 1995
Buku Teks