John John A. Gan, Jacob Israel R. Militar, Charles Kevin G. Paylago, and Dr. Paquito G. Fernando Jr. “PROFOBAT (Protection From Bats) Microcontroller-BasedBat RepellentSystem in Fruit Bearing Trees”. International Engineering Journal For Research & Development, vol. 5, no. Special Issue, Sept. 2020, p. 8, doi:10.17605/OSF.IO/7W6DE.