"Psychology Principles in Practice" by Holt McDougal is a textbook published in 2009 as part of the HMH Curriculum Bundles Series. It is designed for homeschooling students and covers various psychology principles in English language. The trade paperback format makes it portable and easy to use for homeschooling purposes, with a weight of 65.8 ounces. Written by the author Holt McDougal, this textbook serves as a valuable resource for those looking to study psychology in a homeschooling setting.