i used "High Tech Start Up" by John L. Nesheim and I found it very useful.
I wrote a book titled, "How to Write a Business Plan Executive Summary." Have you ever heard of the famous Venture Capitalist and Author, Guy Kawasaki? In his book, The Art of the Start, he said,
"Of the effort you put into write a business plan, 80 percent should go into the executive summary. These are the most important paragraphs of your organization’s existence.”
That is why I believe that this Executive Summary book will provide great value to you in your effort to write your business plan. You can find it at http://www.howtowriteanexecutivesummary.com. Or you can access my free business planning resources at my ExecutivePlan Blog.