APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

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