APA (7th ed.) Citation

Rudolphi, H., & Salas, C. d. (1928). Países polares. Labor.

Chicago Style (17th ed.) Citation

Rudolphi, Hans, and Carlos de Salas. Países Polares. Barcelona: Labor, 1928.

MLA (9th ed.) Citation

Rudolphi, Hans, and Carlos de Salas. Países Polares. Labor, 1928.

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