Hirst, Paul, author
Macmillan, 1979
Buku Teks
by A.D. Cliff ... [and others]
Oxford University Press, 2010
Buku Teks
Nevins, Allan, 1890-1971, author
Macmillan, 1927
Buku Teks
Pfeiffer, John E., author
McGraw-Hill , 1977
Buku Teks
Turner, Jonathan H., author
Thomson, Wadsworth, 2007
Buku Teks