This is the latest version of the original Practical Font Design. The 3rd Edition Plus was only released as a Kindle book originally. Eventually, an ePUB was made available.
This is the book that surprised the font design community by teaching a practical design workflow without all the theory and academic falderal. This book is for graphic designers and computer graphics artists who have come to love fonts and want to do one of their own. Instead of a workflow that takes a year or more, wandering around piecemeal in the designer's spare time, this will enable a designer to work part-time and get a font designed and ready to use in a month or so.
This is very practical stuff!