APA (7th ed.) Citation

Collins, S., & Boehmer, P. (2008). Gregor and the marks of secret (Unabridged.). Listening Library.

Chicago Style (17th ed.) Citation

Collins, Suzanne, and Paul Boehmer. Gregor and the Marks of Secret. Unabridged. New York: Listening Library, 2008.

MLA (8th ed.) Citation

Collins, Suzanne, and Paul Boehmer. Gregor and the Marks of Secret. Unabridged. Listening Library, 2008.

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