Roosevelt, T., Hay, J., Trevelyan, S. G. O., & Gray, D. (1954). Cowboys and kings: Three great letters. Harvard University Press.
Chicago Style (17th ed.) CitationRoosevelt, Theodore, John Hay, Sir George Otto Trevelyan, and David Gray. Cowboys and Kings: Three Great Letters. Cambridge: Harvard University Press, 1954.
MLA (9th ed.) CitationRoosevelt, Theodore, et al. Cowboys and Kings: Three Great Letters. Harvard University Press, 1954.
Warning: These citations may not always be 100% accurate.