Timings, R.L. (Roger Leslie), 1927-, author
Longman, 1988
Buku Teks
Holtzapple, Mark T., author
McGraw-Hill, 2003
Buku Teks
Wright, Paul H., author
John Wiley & Sons, 1994
Buku Teks
Eide, Arvid R., author
McGraw-Hill, 2002
Buku Teks
Dana, Forest C.
New York: McGraw-Hill, 1958
Buku Teks