APA citiranje

Sidman, J., & Krommes, B. (2011). Swirl by swirl: Spirals in nature. Houghton Mifflin Harcourt.

Chicago Style (17th ed.) Citation

Sidman, Joyce, and Beth Krommes. Swirl by Swirl: Spirals in Nature. Boston: Houghton Mifflin Harcourt, 2011.

MLA citiranje

Sidman, Joyce, and Beth Krommes. Swirl by Swirl: Spirals in Nature. Houghton Mifflin Harcourt, 2011.