Brookings institution, 1949
Buku Teks
Haviland, H. Field, author
The Brooking Institution, 1960
Buku Teks
Brokings Institution, 1950
Buku Teks
Brockway, Thomas P.
D. Van Nostrand Company, Inc. , 1957
Buku Teks
Randall, Clarence B.
The University of Chicago Press, 1954
Buku Teks