Teaching Secondary School Chemistry:  A textbook for teachers in developing countries/ 
Twoli Nicholas W. 
 - Nairobi, Kenya  Nehema Publishers  2006 
 - iv,176p. 
<br/><br/><label>ISBN: </label>9789966704948 
<br/><br/><label>LC Class. No.: </label>QD478  / .T96 2006