APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

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