The relationship between an author and a publisher is contractual. Whether or not you have transferred your copyright to the publisher is governed by the language of the contract you signed with your publisher.
The Copyright Handbook: What Every Writer Needs to Know
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Nimmer on Copyright
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Form books can be helpful in drafting agreements:
American Jurisprudence Legal Forms , 2d
Commercial Agreements: A Lawyer's Guide to Drafting and Negotiating
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Current Legal Forms with Tax Analysis
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West's Legal Forms