Patricia Harris Ph.D. 
Why Are There So Many Programming Languages? [PDF ebook] 

If computers reduce everything to the binary number system of 0s and 1s, then why are there so many programming languages? In this book, readers explore how different languages have developed to fill specific needs and solve unique problems. Readers will also review the historical development path of languages and see how the future of programming may not even involve coding. Topics include scripting versus computing languages, content-specific programming, and special needs programming. Helpful diagrams and accessible language make this a programming guide every young coder should have on their bookshelf.