APA (7th ed.) Citation

Recorded Books, Inc, & Guidall, G. (1990). Beowulf. Recorded Books.

Chicago Style (17th ed.) Citation

Recorded Books, Inc, and George Guidall. Beowulf. Prince Frederick, MD: Recorded Books, 1990.

MLA (9th ed.) Citation

Recorded Books, Inc, and George Guidall. Beowulf. Recorded Books, 1990.