Alfarabi, Book of Letters (Kitāb Al-Ḥurūf), English Translation with Introduction, Interpretive Essay, and Annotations, Plus Muhsin Mahdi’s Revised Edition of the Arabic Text by Charles E. Butterworth, Foreword by Hamza Yusuf, Zaytouna College, Berkeley, CA 2024 (The Zaytuna Curriculum Series), 576 pp., ISBN: 9781733836340