Nevins, Allan, 1890-1971, author
Macmillan, 1927
Buku Teks
Pfeiffer, John E., author
McGraw-Hill , 1977
Buku Teks
Murphy, Craig, author
West View Press, 1984
Buku Teks
Turner, Jonathan H., author
Thomson, Wadsworth, 2007
Buku Teks
Niel, Robert Van, author
Foris Publications, 1960
Buku Teks