The printed book was first published in November 2017 in a paperback format with purple cover, which is typical for monographs in Foundations and Trends® in Signal Processing.
In January 2018, the hardback version appeared with the following cover:
We recommend you to buy the book from the publisher website, where the list price is $99 (including shipping costs). The book is printed in color and contains main illustrations and figures. If you visit the publisher’s booth on conferences, you might get the book for a special price!
Apart from the different covers, the hardback and paperback versions of the book are identical.