Latourette, Kenneth Scott
Macmillan, 1951
Buku Teks
Hyma, Albert
George Wahr, 1953
Buku Teks
Peffer, Nathaniel
University of Michigan Press, 1958
Buku Teks
Meyer, Milton W.
Barnes & Noble, 1972
Buku Teks
Vinache, Harold M.
George Allen and Unwin, 1950
Buku Teks