APA (7th ed.) Citation

Cronin, A. J., & Pepe, E. La ciudadela.

Chicago Style (17th ed.) Citation

Cronin, Archibald Joseph, and Enrique Pepe. La Ciudadela. Barcelona.

MLA (9th ed.) Citation

Cronin, Archibald Joseph, and Enrique Pepe. La Ciudadela.

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