UNAFEI, 1982
Buku Teks
Shelden, Randall G., author
Little, Brown, 1982
Buku Teks
Jones, Mark, author
Elsevier, 2012
Buku Teks
edited by William B. Sanders and Howard C. Daudistel
Praeger, 1976
Buku Teks
Samaha, Joel, author
West Publishing, 1988
Buku Teks