Bozeman, Barry, author
St. Martin's Press, 1979
Buku Teks
Leyendecker, Hilary M., author
Harper & Brothers, 1955
Buku Teks
Parsons, Wayne, author
Kencana Prenada Media Group, 2011
Buku Teks
Cohen, Harry
The Iowa State University Press, 1965
Buku Teks
Scott, Foresman, 1971
Buku Teks