Cita APA (7th ed.)

Twain, M., & Leary, L. (1961). Mark Twain's Letters to Mary. Columbia University Press.

Cita Chicago (17th ed.)

Twain, Mark, i Lewis Leary. Mark Twain's Letters to Mary. New York: Columbia University Press, 1961.

Cita MLA (8th ed.)

Twain, Mark, i Lewis Leary. Mark Twain's Letters to Mary. Columbia University Press, 1961.