Wright's Arabic Grammar reviewed by some Islamic sites.
Note the book can also be freely downloaded . See links given above.
No other English-language grammar of the Arabic language is as comprehensive as this classic reference. The sine qua non resource for English-speaking students wishing to master the intricacies of Arabic, it has served as an indispensable aid for over a century. Unlike many more recent grammars, this volume contains virtually no inaccuracies or errors. Although it is purely a reference grammar, it cites many examples of sentences, phrases, and figures of speech from the best classical Arabic prose and poetry. Three indexes assist in finding words, constructions, and grammatical categories amid a wealth of information. [reference: http://islamicbookstore.com/b9005.html , http://www.onlineislamicstore.com/b9005.html ]