Trattner, Walter I., author
Free Press, 1984
Buku Teks
Trattner, Walter I., author
Free Press, 1979
Buku Teks
Asa S. Knowles, editor-in-chief.
McGraw-Hill, 1970
Buku Referensi
Zeller, Eduard, 1814-1908, author
Meridian Books, 1960
Buku Teks
Fung, Yu-lan
The Free Press, 1976
Buku Teks