APA (7th ed.) Citation

Johnson, J. R., Bill, A. H., & Milhollen, H. D. (1960). Horsemen, blue and gray: A pictorial history. Oxford University Press.

Chicago Style (17th ed.) Citation

Johnson, James Ralph, Alfred Hoyt Bill, and Hirst Dillon Milhollen. Horsemen, Blue and Gray: A Pictorial History. New York: Oxford University Press, 1960.

MLA (9th ed.) Citation

Johnson, James Ralph, et al. Horsemen, Blue and Gray: A Pictorial History. Oxford University Press, 1960.