APA (7th ed.) Citation

Levy, D. H. (2008). Observar el cielo. Planeta.

Chicago Style (17th ed.) Citation

Levy, David H. Observar El Cielo. Barcelona: Planeta, 2008.

MLA (9th ed.) Citation

Levy, David H. Observar El Cielo. Planeta, 2008.

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