Doty, Steve, author
CRC Press, Taylor & Francis Group, 2009
Buku Referensi
Penn, Ira A., author
Gower, 1998
Buku Teks
Clark, John R., author
Lewis Publishers, 1996
Buku Referensi
editor-in-chief, Hardam Singh Azad
McGraw-Hill, 1976
Buku Referensi
editor in chief, Gerard H. "Gus" Gaynor
McGraw-Hill, 1996
Buku Referensi