This Fiber Trends
The Magic Loop Pattern Booklet.
Fiber Trends Magic Loop Knit Pattern Book. No need to use double point needles. In this book learn how to just use one 40" circular needle even for socks.
No needed for double Point needles. 
Work in the around on one 40" circular needle.
You can knit socks and a whole lot more. 
This book has step by step instructions with pictures on how to use this length circular needle. 
It has a sock pattern for women/men and baby: with step by step instructions and pictures.