Cita APA (7th ed.)
Langan, J. (1998). Sentence skills: A workbook for writers : form A (6th ed.). McGraw-Hill.
Cita Chicago (17th ed.)
Langan, John. Sentence Skills: A Workbook for Writers : Form A. 6th ed. Boston: McGraw-Hill, 1998.
Cita MLA (9th ed.)
Langan, John. Sentence Skills: A Workbook for Writers : Form A. 6th ed. McGraw-Hill, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.