Was wondering if there ws any sort of pricing guidelines any of the more professional members here use for pricing your work. Came across "The Photographers Market" at Barnes & Noble, but it really did not price what I was looking for. Basically, a zoo wants to use one of my images for a guidebook they are compiling. Was wondering what sort of price I should tag on it along with the basic one usage limitation with compensation for further use in other media. Granted, it is a zoo so the market is not as large as say newspaper, magazine, book, etc. so I am a litlle stymied as to price. Any help would be appreciated. Thanks.