Durano, F. L. A., Alviola, P. A., IV, Digal, L. N., Oponda, N. B., & Sarmiento, J. M. P. (2019). The effects of altitude on the profitability, productivity, and technical efficiency of cacao farms in Calinan and Marilog Districts, Davao City, Philippines. Banwa.

Durano, Francis Levi A., Pedro A. Alviola, IV, Larry N. Digal, Nilo B. Oponda, and Jon Marx P. Sarmiento. "The Effects of Altitude on the Profitability, Productivity, and Technical Efficiency of Cacao Farms in Calinan and Marilog Districts, Davao City, Philippines." Banwa 2019.

Durano, Francis Levi A., et al. "The Effects of Altitude on the Profitability, Productivity, and Technical Efficiency of Cacao Farms in Calinan and Marilog Districts, Davao City, Philippines." Banwa, 2019.