Wickelgren, W. A. (1974). How to solve problems: Elements of a theory of problems and problem solving. W. H. Freeman.
Chicago Style (17th ed.) CitationWickelgren, Wayne A. How to Solve Problems: Elements of a Theory of Problems and Problem Solving. San Francisco: W. H. Freeman, 1974.
MLA (9th ed.) CitationWickelgren, Wayne A. How to Solve Problems: Elements of a Theory of Problems and Problem Solving. W. H. Freeman, 1974.
Warning: These citations may not always be 100% accurate.