APA (7th ed.) Citation

Sousa, A. S. d. (1929). Historia de Portugal. Labor.

Chicago Style (17th ed.) Citation

Sousa, Antonio Sergio de. Historia De Portugal. Barcelona: Labor, 1929.

MLA (9th ed.) Citation

Sousa, Antonio Sergio de. Historia De Portugal. Labor, 1929.

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