APA (7th ed.) Citation

Audio Archives, Asimov, I., & Piper, H. B. (1970). Dimension X. Audio Archives.

Chicago Style (17th ed.) Citation

Audio Archives, Isaac Asimov, and H. Beam Piper. Dimension X. Houston, Tex.: Audio Archives, 1970.

MLA (9th ed.) Citation

Audio Archives, et al. Dimension X. Audio Archives, 1970.