McKay, John P., author
Houghton Miffiln, 1984
Buku Teks
Lapidus, Ira M., author
Cambridge University Press, 2014
Buku Teks
Cambridge University Press, 2017
Buku Teks
Burns, Edward McNall, 1897-1972, author
WW Norton, 1974
Buku Teks
Rand McNally & Company, 1960
Buku Teks