APA (7th ed.) Citation

Ladd, G. T. (1897). Primer of psychology. Charles Scribner's Sons.

Chicago Style (17th ed.) Citation

Ladd, George Trumbull. Primer of Psychology. New York: Charles Scribner's Sons, 1897.

MLA (9th ed.) Citation

Ladd, George Trumbull. Primer of Psychology. Charles Scribner's Sons, 1897.

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