Mwangi, G. et al <br/><br/>
Mentor Science and Technology Grade 4 /   Learner's Book. 

 - 1st ed. 
 - Nairobi :  Mentor Pulishing Co. Ltd.   2019 
 - ii, 182 p:   15 cm. 
<br/><br/><label>ISBN: </label>9789966012715 
<br/><br/><label>Standard Tech. Report. No.: </label>
<br/><br/><label>Dewey Class. No.: </label>372/500