The “Encyclopedia of Counseling: The Authentic Purple Book” by Howard Rosenthal is a comprehensive textbook published in 2017 by Routledge. This book serves as a valuable resource for students and professionals in the field of counseling, providing detailed information on a wide range of topics within the subject area. With its authentic purple cover and encyclopedic format, this book offers a unique and engaging way to explore the field of counseling, making it a must-have for those dedicated to the study and practice of this field.