APA (7th ed.) Citation

Henkes, K. (2015). Penny and her marble: I can read level 1. Greenwillow Books.

Chicago Style (17th ed.) Citation

Henkes, Kevin. Penny and Her Marble: I Can Read Level 1. New York: Greenwillow Books, 2015.

MLA (8th ed.) Citation

Henkes, Kevin. Penny and Her Marble: I Can Read Level 1. Greenwillow Books, 2015.

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