APA (7th ed.) Citation

Pietrasinski, Z. (1969). The psychology of efficient thinking. Pergamon Press.

Chicago Style (17th ed.) Citation

Pietrasinski, Zbigniew. The Psychology of Efficient Thinking. Oxford: Pergamon Press, 1969.

MLA (9th ed.) Citation

Pietrasinski, Zbigniew. The Psychology of Efficient Thinking. Pergamon Press, 1969.

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