APA (7th ed.) Citation

Alter. (2001). Essential English usage & grammar 1. Times Educational.

Chicago Style (17th ed.) Citation

Alter. Essential English Usage & Grammar 1. Singapore: Times Educational, 2001.

MLA (8th ed.) Citation

Alter. Essential English Usage & Grammar 1. Times Educational, 2001.

Warning: These citations may not always be 100% accurate.