Esmundo, Rosalinda R. Pagulayan, Roberto C. Payawal, Pacifico C. <br/><br/>
Life and the planet earth 

 - Quezon City, Philippines  Learning Resource Center  1999 
 - 211  p. 
<br/><br/><label>ISBN: </label>971-93048-1-2 
<br/><br/><label>Dewey Class. No.: </label>FIL 577 L62 1999 c.1