APA (7th ed.) Citation

Hay, J. (1969). Letters of John Hay and extracts from diary. Gordian Press.

Chicago Style (17th ed.) Citation

Hay, John. Letters of John Hay and Extracts from Diary. New York: Gordian Press, 1969.

MLA (9th ed.) Citation

Hay, John. Letters of John Hay and Extracts from Diary. Gordian Press, 1969.