Langan, J. (2001). Sentence skills with readings (Second Edition.). McGraw Hill.
Cita Chicago (17th ed.)Langan, John. Sentence Skills with Readings. Second Edition. Boston: McGraw Hill, 2001.
Cita MLA (9th ed.)Langan, John. Sentence Skills with Readings. Second Edition. McGraw Hill, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.