The book is distributed free in electronic format under an open licenseCC-BY-NC-SA.
The book is published and distributed on paper by SoftUni and you can buy a copy from SoftUni's reception. (https://softuni.bg/contacts).
The source code of the book can be found in GitHub: https://github.com/SoftUni/Programming-Basics-Book-CSharp-BG.
International Standard Book Number ISBN: TODO.