edited for the International Commission for a History of the Scientific and Cultural Development of Mankind by Guy S. Metraux and Francois Crouzet
New American Library, 1963
Buku Teks
Blau, Peter J., author
CRC Pres, 2008
Buku Teks
Johnson, Julian, author
Radha Soami Beas, 1985
Buku Teks
Ginn and Co., 1974
Buku Teks
Poppy, Willard J.
Prentice-Hall, 1965
Buku Teks