Salera และ Jane C. (1990) The barangay health workers : factors affecting their decision to continue or discontinue as health volunteers, Zamboanga Del Sur, Philippines. Mahidol University,:ม.ป.ท.Salera และ Jane C. 1990. The barangay health workers : factors affecting their decision to continue or discontinue as health volunteers, Zamboanga Del Sur, Philippines. ม.ป.ท.:Mahidol University,;Salera และ Jane C. The barangay health workers : factors affecting their decision to continue or discontinue as health volunteers, Zamboanga Del Sur, Philippines. ม.ป.ท.:Mahidol University, 1990. Print.