APA (7th ed.) Citation

Smiles, S., & Núñez de Prado, G. (1908). El deber. Ramón Sopena.

Chicago Style (17th ed.) Citation

Smiles, Samuel, and Guillermo Núñez de Prado. El Deber. Barcelona: Ramón Sopena, 1908.

MLA (9th ed.) Citation

Smiles, Samuel, and Guillermo Núñez de Prado. El Deber. Ramón Sopena, 1908.

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