Strunk, W. (2007). The elements of style. Penguin Books, USA.
Cita Chicago (17th ed.)Strunk, Wiliam. The Elements of Style. Penguin Books, USA, 2007.
Cita MLA (9th ed.)Strunk, Wiliam. The Elements of Style. Penguin Books, USA, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.