APA (7th ed.) Citation

Walden, M. (2012). Zero hour (1st U.S. ed.). Simon & Schuster Books for Young Readers.

Chicago Style (17th ed.) Citation

Walden, Mark. Zero Hour. 1st U.S. ed. New York: Simon & Schuster Books for Young Readers, 2012.

MLA (8th ed.) Citation

Walden, Mark. Zero Hour. 1st U.S. ed. Simon & Schuster Books for Young Readers, 2012.

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