Little, A. W. Selwyn
American economic problems
The United States Armed Forces Institute, 1941
 Buku Teks
Quint, Howard H
Main problems in American history
Dorsey Press, 1968
 Buku Teks
Daugherty, Carrol R., author
The labor problems of American society
Houghton Mifflin, 1952
 Buku Teks
Mansfield, Edwin, author
Economic problems : principles, problems, decisions
W.W. Norton, 1974
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Stigler, George J.
Five lectures on economic problems
Macmillan, 1950
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