APA (7th ed.) Citation

Waddell, C. W. (1918). An introduction to child psychology. Houghton-Mifflin Company.

Chicago Style (17th ed.) Citation

Waddell, Charles W. An Introduction to Child Psychology. Boston: Houghton-Mifflin Company, 1918.

MLA (9th ed.) Citation

Waddell, Charles W. An Introduction to Child Psychology. Houghton-Mifflin Company, 1918.

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