Maitland-Jones, J.F., author
W.W. Norton, 1974
Buku Teks
by William Brass ... [et al.]
Princenton University Press, 1968
Buku Teks
Saul, John S., author
Monthly Review Press, 1981
Buku Teks
Italiaander, Rolf
Prentice-Hall, 1961
Buku Teks
Ayuk, Elias T., author
[Springer, ], 2012
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