APA (7th ed.) Citation

(1999). About twins (1. ed.). DK Publ.

Chicago Style (17th ed.) Citation

About Twins. 1. ed. New York, NY: DK Publ, 1999.

MLA (9th ed.) Citation

About Twins. 1. ed. DK Publ, 1999.

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