APA (7th ed.) Citation

Asimov, I., & Casals, A. (1980). Luces en el cielo. Sudamericana.

Chicago Style (17th ed.) Citation

Asimov, Isaac, and Arturo Casals. Luces En El Cielo. Buenos Aires: Sudamericana, 1980.

MLA (9th ed.) Citation

Asimov, Isaac, and Arturo Casals. Luces En El Cielo. Sudamericana, 1980.

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