Dunlop, John T.
Holt, 1958
Buku Teks SO
Yoder, Dale
Prentice-Hall, 1962
Buku Teks
Yoder, Dale
Prentice-Hall, 1984
Buku Teks
Jamieson, Stuart
Cornell University Press, 1957
Buku Teks SO
edited by Suresh P. Sethi, Marija Bogataj and Lorenzo Ros-McDonnell
Springer, 2012
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