APA (7th ed.) Citation

Calladine, C. R., & Drew, H. R. (1997). Understanding DNA: The molecule & how it works (2nd ed.). Academic Press.

Chicago Style (17th ed.) Citation

Calladine, C. R., and Horace R. Drew. Understanding DNA: The Molecule & How It Works. 2nd ed. San Diego: Academic Press, 1997.

MLA (8th ed.) Citation

Calladine, C. R., and Horace R. Drew. Understanding DNA: The Molecule & How It Works. 2nd ed. Academic Press, 1997.