APA (7th ed.) Citation

Duncker, K. (1972). On problem-solving. Greenwood Press.

Chicago Style (17th ed.) Citation

Duncker, Karl. On Problem-solving. Westport, Conn: Greenwood Press, 1972.

MLA (9th ed.) Citation

Duncker, Karl. On Problem-solving. Greenwood Press, 1972.

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