Vicki Square: The Knitter's Companion: Expanded and Updated (Companion series, The)
Nancie M. Wiseman: The Knitters Book of Finishing Techniques
Vogue Knitting Magazine Editors: Vogue Knitting: The Ultimate Knitting Book
the instructions for the buttonhole row should read as follows:
Buttonhole Row (RS): K4, (yo, k2tog, k12) twice, (k2tog, yo, k12) twice, k2tog, yo, k4.
Lisa Shobhana Mason: Yarnplay at Home: Handknits for Colorful Living
Lisa Shobhana Mason: Yarnplay: Colorful Techniques And Projects For The Creative Knitter