APA (7th ed.) Citation

Warner, S. B. The old helmet / by Susan Warner. Warne.

Chicago Style (17th ed.) Citation

Warner, Susan Bogert. The Old Helmet / by Susan Warner. London: Warne.

MLA (9th ed.) Citation

Warner, Susan Bogert. The Old Helmet / by Susan Warner. Warne.

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