Rock, Joseph F.
Ancient Na-Khi Kingdom of Southwest China
Harvard University Press, 1947
 Buku Teks SO
Beardsley, Charles
Guam past and present/Charles Beardsley
Charles E.Tuttle, 1967
 Buku Teks SO
This Britain : tradition and achievment
edited by Newton Branch
Macdonald, 1951
 Buku Teks SO
Bell, Charles G.
California Government Today: Politics of reform/ Charles G. Bell, Charles M. Price
Dorsey Press, 1980
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Darwin, Charles Robert
Charles Robert Darwin autobiography edited by Sir and an introductory essay the meaning of Darwin by
New York Henry Schuman 1950
 Buku Teks