APA (7th ed.) Citation

Frost, H. (2001). The circulatory system. Pebble Books.

Chicago Style (17th ed.) Citation

Frost, Helen. The Circulatory System. Minnesota: Pebble Books, 2001.

MLA (9th ed.) Citation

Frost, Helen. The Circulatory System. Pebble Books, 2001.

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