Book excerpt: More people write for the Associated Press than for any newspaper in the world, and more writers --over 1,750,000--have bought The AP Stylebook than any other journalism reference. It provides facts and references for reporters, and defines usage, spelling, and grammar for editors. There are separate sections for journalists specializing in sports and business, and complete guidelines for how to write photo captions, proofread text, file copy over the wire, handle copyrights, and avoid libel. This new edition of the Stylebook has been fully updated with fifty new entries and revisions to more than one hundred others in order to keep pace with world events, common usage, and Associated Press procedures. More than 1.7 million copies sold