APA (7th ed.) Citation

Keene, C. (1968). The spider sapphire mystery. Armada.

Chicago Style (17th ed.) Citation

Keene, Carolyn. The Spider Sapphire Mystery. London: Armada, 1968.

MLA (9th ed.) Citation

Keene, Carolyn. The Spider Sapphire Mystery. Armada, 1968.

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