APA Citation

Geer, J. P. V. D. (1957). A psychological study of problem solving / Geer, Johan Petrus Van De. s.n.

Chicago Style Citation

Geer, Johan Petrus Van De. A Psychological Study of Problem Solving / Geer, Johan Petrus Van De. s.n, 1957.

MLA Citation

Geer, Johan Petrus Van De. A Psychological Study of Problem Solving / Geer, Johan Petrus Van De. s.n, 1957.

Warning: These citations may not always be 100% accurate.