APA (7th ed.) Citation

(1941). The prisoner at Laeken. King Leopold. Legend and fact. With a pref. by R. Keyes. London.

Chicago Style (17th ed.) Citation

The Prisoner at Laeken. King Leopold. Legend and Fact. With a Pref. by R. Keyes. London, 1941.

MLA (8th ed.) Citation

The Prisoner at Laeken. King Leopold. Legend and Fact. With a Pref. by R. Keyes. London, 1941.

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