APA (7th ed.) Citation

Ballard, G. A. (1927). Rulers of the Indian ocean. Duckworth.

Chicago Style (17th ed.) Citation

Ballard, G. A. Rulers of the Indian Ocean. London: Duckworth, 1927.

MLA (8th ed.) Citation

Ballard, G. A. Rulers of the Indian Ocean. Duckworth, 1927.

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