References
^ AZAR & HAGEN (2014). Understanding and Using English Grammar Student Book (without Answer Key) and Online Workbook, 4/e, PEARSON. BiggerBooks. ISBN 9780132455176 (revised Apr 2025)^ (2013). Understanding and Using English Grammar Student Book (without Answer Key) and Online Workbook, 4/e ECampus. ISBN 9780132455176 (revised Oct 2019)
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