edited by David Collier
Princeton University Press, 1979
Buku Teks
Pierson, William W., author
D. Van Nostrand, 1953
Buku Teks
Stuart, Graham H. (Graham Henry), 1887-, author
Appleton-Century-Crofts, 1955
Buku Teks
Porter, Charles O. (Charles Orlando), 1919-2006, author
Macmillan, 1961
Buku Teks
Cambridge University Press, 1997
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