ACKNOWLEDGEMENT

We wish to acknowledge those who have contributed to various stages of this book.

Our special appreciation goes to Prof. M.O. Ibrahim, Prof. Mamman Musa, Prof. Y. K. Kajuru, Prof. Inekwe O. and Prof. C. Bolaji and all the authors of the books consulted during the writing of this book. 

Our special thanks go to Dr. D. Beji, Dr. Auwal Haruna Gera, Mal. Idris Musa, Prof. Ramatu Gimba and all others not mentioned. May Almighty Allah bless you all for your contributions towards the success of this book.

Thank you all.