Here is some very basic sample copyright text. There is a nice article here explaining Copyright in more detail.
Copy, paste and amend the text in red to match your own requirements:
Copyright © YYYY by Author Name
All rights reserved. This book or any portion thereof
may not be reproduced or used in any manner whatsoever
without the express written permission of the publisher
except for the use of brief quotations in a book review.
Published in the Country
First Printing, YYYY
Publisher’s Name / Company