Cambridge University Press, 2017
Buku Teks
Burns, Edward McNall, 1897-1972
WW Norton, 1974
Buku Teks
Lapidus, Ira M.
Cambridge University Press, 2014
Buku Teks
Rand McNally & Company, 1960
Buku Teks
Parents' Magazine's Cultural Institute, 1965
Buku Referensi