Copperud, R. (1961). Words on paper. Hawthorn Books.
Cita Chicago Style (17a ed.)Copperud, Roy. Words on Paper. New York, Estados Unidos: Hawthorn Books, 1961.
Cita MLA (9a ed.)Copperud, Roy. Words on Paper. Hawthorn Books, 1961.
警告：這些引文格式不一定是100％准確.