Παραπομπή APA

Wickelgren, W. A. (1974). How to solve problems: Elements of a theory of problems and problem solving. San Francisco: W. H. Freeman.

Παραπομπή Chicago Style

Wickelgren, Wayne A. How to Solve Problems: Elements of a Theory of Problems and Problem Solving. San Francisco: W. H. Freeman, 1974.

Παραπομπή MLA

Wickelgren, Wayne A. How to Solve Problems: Elements of a Theory of Problems and Problem Solving. San Francisco: W. H. Freeman, 1974.

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