APA (7th ed.) Citation

Johnson, H. J. T. (1933). Vatican diplomacy in the world war. B. Blackwell.

Chicago Style (17th ed.) Citation

Johnson, Humphrey J. T. Vatican Diplomacy in the World War. Oxford: B. Blackwell, 1933.

MLA (8th ed.) Citation

Johnson, Humphrey J. T. Vatican Diplomacy in the World War. B. Blackwell, 1933.