Portable Document Format (PDF) is an increasingly popular standard for e-books (and hundreds of other uses) because of how well it preserves formatting across many platforms. The most robust tool for creating PDFs is Adobe Acrobat (which starts at $299.) For cheaper alternatives, try Adobe’s online convertor or pdfFactory. Both let you try before you buy.
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Feldman, Barbara. "Portable Document Format." Surfnetkids. Feldman Publishing. 1 Jul. 2003. Web. 4 Dec. 2014. <http://www.surfnetkids.com/tech/185/internet-tip-of-the-week-3/ >.