Cita APA (7a ed.)

Titley, P., Evans, H., & Petts, K. (1978). The dark ages (1. publ.). Owlet books.

Cita Chicago Style (17a ed.)

Titley, Paul, Hilary Evans, y Ken Petts. The Dark Ages. 1. publ. London [u.a.]: Owlet books, 1978.

Cita MLA (9a ed.)

Titley, Paul, et al. The Dark Ages. 1. publ. Owlet books, 1978.