APA (7th ed.) Citation

Smiles, S. (1935). El deber. Editorial Ramón Sopena.

Chicago Style (17th ed.) Citation

Smiles, Samuel. El Deber. Barcelona: Editorial Ramón Sopena, 1935.

MLA (9th ed.) Citation

Smiles, Samuel. El Deber. Editorial Ramón Sopena, 1935.

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