APA (7th ed.) Citation

Kline, S., & Heller, J. (2008). Horrible harry cracks the code (Unabridged.). Recorded Books Inc..

Chicago Style (17th ed.) Citation

Kline, Suzy, and Johnny Heller. Horrible Harry Cracks the Code. Unabridged. Prince Frederick: Recorded Books Inc., 2008.

MLA (8th ed.) Citation

Kline, Suzy, and Johnny Heller. Horrible Harry Cracks the Code. Unabridged. Recorded Books Inc., 2008.

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