APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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