The Elements of Style; How to Speak and Write Correctly

The Elements of Style by William Strunk, Jr.
Asserting that one must first know the rules to break them, this classic reference book is a must-have for any student and conscientious writer. Intended for use in which the practice of composition is combined with the study of literature, it gives in brief space the principal requirements of plain English style and concentrates attention on the rules of usage and principles of composition most commonly violated.

How to Speak and Write Correctly by Joseph Devlin
In the preparation of this work the writer has kept one end in view, viz.: To make it serviceable for those for whom it is intended, that is, for those who have neither the time nor the opportunity, the learning nor the inclination, to peruse elaborate and abstruse treatises on Rhetoric, Grammar, and Composition. This book is a must-have for any student and conscientious writer.