Little, A. W. Selwyn
American economic problems
The United States Armed Forces Institute, 1941
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Daugherty, Carrol R.
The labor problems of American society
Houghton Mifflin, 1952
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Quint, Howard H
Main problems in American history
Dorsey Press, 1968
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Computing methods in optimization problems
Springer-Verlag, 1969
 Buku Teks SO
Numerical methods in thermal problems
edited by R.W. Lewis
Pineridge Press, 1979
 Buku Teks SO