APA (7th ed.) Citation

Yourcenar, M., & Calatayud, E. (1994). Opus nigrum. Alfaguara.

Chicago Style (17th ed.) Citation

Yourcenar, Marquerite, and Emma Calatayud. Opus Nigrum. España: Alfaguara, 1994.

MLA (9th ed.) Citation

Yourcenar, Marquerite, and Emma Calatayud. Opus Nigrum. Alfaguara, 1994.

Warning: These citations may not always be 100% accurate.