M. Bender , 1975
Buku Teks
Scheb, John M., author
Thomson Wadworth, 2005
Buku Teks
Gellhorn, Ernest, author
West Publishing Company, 1972
Buku Teks
Lorch, Robert S., author
Wayne State University Press, 1969
Buku Teks
Boyle, Alan, author
Oxford University Press, 2007
Buku Teks