I introduce you to the four most commonly used heel construction methods for both cuff-down and toe-up socks. All of these heel types have also their variations which for the flap and gusset heel are for instance the French or the Dutch heel.
The Sock Knitter's Handbook: Expert Advice, Tips, and Tricks: Parrott, Beth, Schurch, Charlene: 9781604680461: : Books
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3 Must-Know Sock Heels + Pattern Recommendations
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