APA (7th ed.) Citation

Yourcenar, M., & Calatayud, E. (1982). Opus nigrum (2. ed.). Alfaguara.

Chicago Style (17th ed.) Citation

Yourcenar, Marguerite, and Emma Calatayud. Opus Nigrum. 2. ed. Madrid: Alfaguara, 1982.

MLA (9th ed.) Citation

Yourcenar, Marguerite, and Emma Calatayud. Opus Nigrum. 2. ed. Alfaguara, 1982.