Bernays, Edward L., author
University of Oklahoma Press, 1952
Buku Teks
edited by Carl S. Shoup
Aldine Publishing, 1969
Buku Teks
Dalton, Hugh
Routledge & Kegan Paul , 1948
Buku Teks
Dalton, Hugh
Routledge dan Kegan Paul , 1954
Buku Teks
Meier, Andreas, author
[Springer, Springer], 2012
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