APA (7th ed.) Citation

Dunn, J., & Plomin, R. (1990). Separate lives: Why siblings are so different. Basic Books.

Chicago Style (17th ed.) Citation

Dunn, Judy, and Robert Plomin. Separate Lives: Why Siblings Are so Different. New York, N.Y.: Basic Books, 1990.

MLA (9th ed.) Citation

Dunn, Judy, and Robert Plomin. Separate Lives: Why Siblings Are so Different. Basic Books, 1990.