Wallbank, T. Walter, author
Scott, Foresman, 1965
Buku Teks
Toynbee, Arnold J., author
Oxford University Press , 1957
Buku Teks
Resnikoff, H.L.
Holt, Rinehart and Winston, 1973
Buku Teks
Lipson, Leslie, author
Vakils, Feffer and Simons Private, 1964
Buku Teks
Toynbee, Arnold J., author
Meridian Books, 1958
Buku Teks