Rob, Peter, author
Course Technology, 2002
Buku Teks
Kroenke, David M., 1946-, author
Pearson - Prentice Hall, 2004
Buku Teks
Kroenke, David M., 1946-, author
Science Research Association, 1983
Buku Teks
Rob, Peter, author
Wadsworth, 1993
Buku Teks
Rishe, Naphtali, author
McGraw-Hill, 1992
Buku Teks