Oranan Kalantapura. (2009) Economy of Scale in Local Public Service: A Case Study of Garbage Collection and Disposal Services of Local Administrative Organizations in Nakon Sawan Province. <i>NIDA Development Journal</i>, <i>49</i>(3), 221-249.Oranan Kalantapura. "Economy of Scale in Local Public Service: A Case Study of Garbage Collection and Disposal Services of Local Administrative Organizations in Nakon Sawan Province". NIDA Development Journal 49 (2009):221-249.Oranan Kalantapura. Economy of Scale in Local Public Service: A Case Study of Garbage Collection and Disposal Services of Local Administrative Organizations in Nakon Sawan Province. National Institute of Development Administration:ม.ป.ท. 2009.