The Internet Grammar of English--a free online course in English grammar written primarily for university undergraduates.
Purdue University's Online Writing Lab (OWL)--offers definitions of grammar and help with writing compositions in English.
Using English --A large collection of English as a Second Language (ESL) tools & resources for students, teachers, learners and academics, covering the full spectrum of ESL, EFL, ESOL, and EAP subject areas.
Wallwork, Adrian. English for Academic Research : grammar exercises. New York : Springer, 2013.
Muschla, Gary Robert. Exploring grammar. New York : McGraw Hill, 2011. (Education Curriculum TEXT. 372.6 MCGRH2011)
Fenn, Peter. A student's advanced grammar of English. Tübingen : Francke Verlag, 2010. Rohdenburg, Günter and Julia Schlüter, eds. (Main Stacks 425 F36s)
One language, two grammars? : differences between British and American English. Cambridge, UK : Cambridge University Press, 2009. (Literatures & Languages PE1072 .O54 2009)
To find more English grammars, search the Classic Catalog using the subject heading English Language Grammar or the VuFind Catalog using the subject descriptor English Grammar. Additional keywords and phrases that can narrow the search:
study and teaching, English language, composition and exercises, usage, etc.