APA (7th ed.) Citation

Vickers, K. H. Humphrey, Duke of Gloucester: A Biography.

Chicago Style (17th ed.) Citation

Vickers, Kenneth Hotham. Humphrey, Duke of Gloucester: A Biography.

MLA (9th ed.) Citation

Vickers, Kenneth Hotham. Humphrey, Duke of Gloucester: A Biography.

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