Cruz, Ronaldo Jr. E., <br/><br/>
Solar powered coin-activated charging system/ 
Ronaldo E. Cruz Jr., Richard A. Lomeda, Jeffrey Z. Reginales 
 - Nabua, Camarines Sur :  Camarines sur Polytechnic Colleges ;  2015. 
 - 64 leaves 
<br/><br/>Undergraduate Thesis (BSEE) - Electrical Engineering