APA (7th ed.) Citation

Pratchett, T., & Briggs, S. (2007). The dark side of the sun. ISIS Audio Books.

Chicago Style (17th ed.) Citation

Pratchett, Terry, and Stephen Briggs. The Dark Side of the Sun. Oxford: ISIS Audio Books, 2007.

MLA (9th ed.) Citation

Pratchett, Terry, and Stephen Briggs. The Dark Side of the Sun. ISIS Audio Books, 2007.