J. B. A. N. Martinez, “Profitability of Robusta Coffee (Coffea canephora L.) at farm level in Quirino, Philippines”, Int. J. Multidiscip. Appl. Bus. Edu. Res., vol. 4, no. 7, pp. 2558–2565, Jul. 2023, doi: 10.11594/ijmaber.04.07.32.