APA (7th ed.) Citation

Wren & Martin. Key to Wren & Martin's High School English Grammar and composition.

Chicago Style (17th ed.) Citation

Wren & Martin. Key to Wren & Martin's High School English Grammar and Composition.

MLA (9th ed.) Citation

Wren & Martin. Key to Wren & Martin's High School English Grammar and Composition.

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