Reference

I met a girl who researches and buys stock images for educational textbooks. I thought her list of best places to go for research/reference images might help:

APimages.com
gettyimages.com
corbis.com
shutterstock.com
fotolia.com
istockphoto.com
lebrecht.co.uk
jupiterimages.com
photolibrary.com
alamy.com
granger.com
northwindpictures.com
reduxpictures.com

-CKL