Bossing, Nelson L., author
Solving our problems in a democracy
Laidlaw Brothers, 1956
 Buku Teks
Hall, J. Oliver, author
Problem solving in our America democracy
America Book Company, 1958
 Buku Teks
Hall, John Oliver, author
Problem solving in our American democracy
American Book Company, 1958
 Buku Teks
Smith, R. Nelson, author
Solving general chemistry problems
W.H. Freeman, 1980
 Buku Teks
Carter, Stephen L.
Civility : manners, morals, and the etiquette of democracy / Stephen L. Carter
Basic Books, 1998
 Buku Teks
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