автор: M. A. Cheryl Erwin

M.A. Cheryl Erwin & Roslyn Ann Duffy: Positive Discipline: The First Three Years

M.A. Cheryl Erwin & Roslyn Ann Duffy: Positive Discipline for Preschoolers

M.A. Cheryl Erwin & Ed.D. Jane Nelsen: Positive Discipline for Childcare Providers

M.A. Cheryl Erwin & Carol Delzer: Positive Discipline for Single Parents, Revised and Updated 2nd Edition

M.A. Cheryl Erwin & Roslyn Ann Duffy: Positive Discipline for Preschoolers, Revised 4th Edition

M.A. Cheryl Erwin & Roslyn Ann Duffy: Positive Discipline: The First Three Years, Revised and Updated Edition