All rights reserved.

First Edition 1406 AH = 1986 AD

Second Edition 1412 AH = 1992 AD

Third Edition 1417 AH = 1997 AD

Corrected and Revised

Dar Alam Al-Kutub For Printing, Publishing, and Distribution Al-Ulya - West of the Desalination Foundation (Al-Tahliyah) - Tel: 4651689 / 4631722 P.O. Box 6460 - Riyadh 11442 - Telefax: 4631336 Kingdom of Saudi Arabia