APA (7th ed.) Citation

Hills, G. El Peñón de la discordia. Historia de Gibraltar.

Chicago Style (17th ed.) Citation

Hills, George. El Peñón De La Discordia. Historia De Gibraltar.

MLA (8th ed.) Citation

Hills, George. El Peñón De La Discordia. Historia De Gibraltar.

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