Cowper, W. (1926). Selected letters. J. M. Dent.
Cita Chicago Style (17a ed.)Cowper, William. Selected Letters. London: J. M. Dent, 1926.
Cita MLA (9a ed.)Cowper, William. Selected Letters. J. M. Dent, 1926.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.