Copyright reserved. First edition, 1406 AH = 1986 AD. Second edition, 1412 AH = 1992 AD. Third edition, 1417 AH = 1997 AD. Corrected and revised. Dār ʿĀlam al-Kutub for Printing, Publishing, and Distribution. al-ʿUlyā, west of al-Taḥliya Foundation, Tel: 4651689/4631722. P.O. Box 6460, Riyadh 11442, Telefax: 4631336, Kingdom of Saudi Arabia.