Copperud, R. (1961). Words on paper. Hawthorn Books.
Cita Chicago (17th ed.)Copperud, Roy. Words on Paper. New York, Estados Unidos: Hawthorn Books, 1961.
Cita MLA (9th ed.)Copperud, Roy. Words on Paper. Hawthorn Books, 1961.
Atenció: Aquestes cites poden no estar 100% correctes.