Check out this site that has videos for you to view KnittingHelp.com that teaches several methods including double pointed needle (dpn) - the one at a time method.
|They came out really great - again they remind|
me of Pippi Longstocking!
2-At-a-Time Socks: The Secret of Knitting Two at Once on One Circular Needle by Melissa Morgan-Oakes
Two books that I own from Wendy D. Johnson include: Socks from the Toe Up: Essential Techniques and Patterns from Wendy Knits and Toe-Up Socks for Every Body: Adventurous Lace, Cables, and Colorwork from Wendy Knits