A writer recently asked me which textbooks I would recommend for an introductory class in technical writing.
If I were teaching such a course, I might suggest
these three books:
Microsoft Manual of Style for Technical Publications
Third Edition (Paperback). A standard in the
industry, and it's relatively cheap, $17 on Amazon.
Writing Tools by Roy Peter Clark. I think every
technical writer should own this book. It will help
anyone write clearly, concisely, and efficiently.
The Elements of Style, Fourth Edition (Hardcover)
Strunk, White and Angell. Essential.