Hamberg, Daniel, author
Macmillan, 1951
Buku Teks
Hald, Earl C., author
Houghton-Mifflin, 1954
Buku Teks
Gaynor, Patricia E., author
McGraw-Hill, 1994
Buku Teks
Nersesian, Roy L.
Quorum Books , 1990
Buku Teks
Hanke, John E., author
Pearson - Prentice Hall, 2009
Buku Teks