APA (7th ed.) Citation

Belloc, H., & Chesterton, G. K. (1926). The emerald of Catherine the Great. Arrowsmith.

Chicago Style (17th ed.) Citation

Belloc, Hilaire, and G. K. Chesterton. The Emerald of Catherine the Great. London: Arrowsmith, 1926.

MLA (8th ed.) Citation

Belloc, Hilaire, and G. K. Chesterton. The Emerald of Catherine the Great. Arrowsmith, 1926.