100 Ways to Improve Your Writing (Updated): Proven Professional Techniques for Writing with Style and Power
Economical Writing, Third Edition: Thirty-Five Rules for Clear and Persuasive Prose (Chicago Guides to Writing, Editing, and Publishing)
amazon.comrobyn bieber and added
As for how to write well, here's the short version: Write a bad version 1 as fast as you can; rewrite it over and over; cut out everything unnecessary; write in a conversational tone; develop a nose for bad writing, so you can see and fix it in yours; imitate writers you like; if you can't get started, tell someone what you plan to write about, the... See more
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The Sense of Style: The Thinking Person's Guide to Writing in the 21st Century
amazon.comrobyn bieber and added