Two at a Time Socks on One Needle (Magic Loop) or Two - YouTube
2-at-a-Time Socks: Revealed Inside. . . The Secret of Knitting Two at Once on One Circular Needle; Works for any Sock Pattern!: Morgan-Oakes, Melissa: 9781580176910: Amazon.com: Books
2 Socks at-a-Time, Magic Loop - v e r y p i n k . c o m - knitting patterns and video tutorials
Two-at-a-time magic loop socks – Knit with Henni
Tips for Practical Sock Knitting: Knitting Two Socks at Once | PieceWork