Copyright

The best way to protect your income and copyright in this case is through copyright registration. With your proof of registration you could use it to issue a cease and desist in cases where your work is used without your consent.

Register it with the copyright commission. Then you can sue for share of profits where it is used without your permission to gain income. Also to prevent them from further use of it without your permission. But be sure to give a Lawyer to review the contract before signing if the institution require you to sign something before getting the book from you.