APA (7th ed.) Citation

Ludlum, R. The Cay of The Halidon. Harper Collins Publishers.

Chicago Style (17th ed.) Citation

Ludlum, Robert. The Cay of The Halidon. London: Harper Collins Publishers.

MLA (9th ed.) Citation

Ludlum, Robert. The Cay of The Halidon. Harper Collins Publishers.

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