APA (7th ed.) Citation

Suzanne Collins. (2006). Gregor And the Marks of secret: The underland chronicles 4 (1st.). Scholastic Inc.

Chicago Style (17th ed.) Citation

Suzanne Collins. Gregor And the Marks of Secret: The Underland Chronicles 4. 1st. London: Scholastic Inc, 2006.

MLA (9th ed.) Citation

Suzanne Collins. Gregor And the Marks of Secret: The Underland Chronicles 4. 1st. Scholastic Inc, 2006.

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