The Ruby Way: Solutions and Techniques in Ruby Programming - Hal Fulton, André Arko - Google Books

https://books.google.de/books?id=uT6eBgAAQBAJ&pg=PA444&dq=Shoes+4+Ruby&hl=de&sa=X&ved=0ahUKEwiC5dmtssDVAhWJJJQKHXczATEQ6AEIJzAA#

For more than a decade, Ruby developers have turned to The Ruby Way for reliable “how-to” guidance on effective Ruby programming. Now, Hal Fulton and André Arko have thoroughly updated this classic guide to cover new language enhancements and developers’…