"Principles of Auditing and Other Assurance Services, 19th Edition" by O. Ray Whittington is a comprehensive textbook that provides a thorough introduction to auditing principles and practices, emphasizing the importance of auditing in the context of financial reporting and assurance services. This edition covers key topics such as the auditing process, the role of the auditor, ethical considerations, internal controls, and the impact of technology on auditing. It also includes real-world examples, case studies, and updates on current regulations and standards, making it a valuable resource for students and professionals in accounting and auditing. The book aims to equip readers with the knowledge and skills necessary to understand and apply auditing concepts effectively in various business environments.