APA (7th ed.) Citation

Riordan, A., & Helicopter, B. (2005). Improbable frequency: A musical comedy. Nick Hern Books.

Chicago Style (17th ed.) Citation

Riordan, Arthur, and Bell Helicopter. Improbable Frequency: A Musical Comedy. London: Nick Hern Books, 2005.

MLA (9th ed.) Citation

Riordan, Arthur, and Bell Helicopter. Improbable Frequency: A Musical Comedy. Nick Hern Books, 2005.