The "Programming Expert Systems in PASCAL" manual reference guide, authored by Brian Sawyer Foster, is a textbook focused on teaching programming concepts and techniques in the Pascal programming language. Designed for educational purposes, this book serves as a comprehensive resource for students and professionals looking to enhance their knowledge and skills in programming. With a clear emphasis on practical instruction and real-world applications, this textbook offers a valuable reference guide for those interested in deepening their understanding of programming expert systems in Pascal.