Most sources will tell you to pick up a copy of The Writer's Market and start there.
However, it may be just as effective (or moreso) to simply go to their website. I bought the paper version and ended up not using it at all, in favor of the website which is more convenient.
The hard-copy Writer's Market book does offer some helpful advice as to writing query letters and the like! But, you can get just as helpful advice for free online, so in that respect it's still questionable.
Did you find an agent there?
I don't know how many published nonfic writers we have here. Nonfiction is a totally different animal from, say, novels.
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