This shows how to do extended crochet stitches including Extended Half Double Crochet(ehdc), Extended Double Crochet(edc), Extended Treble Crochet(etr) & Extended Double Treble Crochet(edtr)
by The Crochet Crowd
by BAG-O-DAY CROCHET & MORE
by HelenMay Crochet
by American Crochet Association
by Crochet Ever After
by Mini Knitting