Azar, b. s. (1989). Understanding and using english grammar. Prentice Hall Regents.
Cita Chicago (17th ed.)Azar, betty schrampher. Understanding and Using English Grammar. Prentice Hall Regents, 1989.
Cita MLA (9th ed.)Azar, betty schrampher. Understanding and Using English Grammar. Prentice Hall Regents, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.