Mawsoo'ah al-'Aqeedah wa al-'Adyaan wa al-Faruq wa al-Madhaahib موسوعة العقيدة والأديان والفرق والمذاهب المعاصرة
This is an Encyclopedia that was compiled and written by 36 different Scholars and researchers that covers everything that deals with 'Aqeedah. Printed in 6 Volumes on yellow paper. This book is a must-have for any serious student of knowledge.