APA (7th ed.) Citation

(1920). Who was who: Containing the biographies of those who died during the decade. Black.

Chicago Style (17th ed.) Citation

Who Was Who: Containing the Biographies of Those Who Died During the Decade. London: Black, 1920.

MLA (8th ed.) Citation

Who Was Who: Containing the Biographies of Those Who Died During the Decade. Black, 1920.

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