Ricki Lewis ... [and others]
McGraw-HIll, 2002
Buku Teks
Muzos, Steven J.
Harper Collins College, 1992
Buku Teks
Smith, Ella Thea, author
Harcourt, Brace & World, 1961
Buku Teks
Breneman, W.R., author
Xerox College Publishing, 1959
Buku Teks
Krogh, David, author
Pearson, 2009
Buku Teks