APA (7th ed.) Citation

Keene, C. (1972). The Nancy Drew Mystery Stories: The Message In the Hollow oak : The Invisible Intrunder. Armanda.

Chicago Style (17th ed.) Citation

Keene, Carolyn. The Nancy Drew Mystery Stories: The Message In the Hollow Oak : The Invisible Intrunder. London: Armanda, 1972.

MLA (9th ed.) Citation

Keene, Carolyn. The Nancy Drew Mystery Stories: The Message In the Hollow Oak : The Invisible Intrunder. Armanda, 1972.

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