1. G.C. Price, “Coffee prices close 2022 on a stable note, coalescing at around 160 US cents/lb,” 2022.
2. Temperature and rainfall impacts on robusta coffee bean characteristics;Kath;Clim. Risk Manag.,2021
3. ICO, “Survey on the impact of low coffee prices on exporting countries,” no. Icc 124–4 4, p. 23, 2019.
4. Production and commercialization of benzoin resin: exploring the value of benzoin resin for local livelihoods in North Sumatra, Indonesia;Harada;Trees, For. People,2022
5. I.B. Suryaningrat, “Implementation of green supply chain management for sustainable agroindustry in coffee processing unit, a case of Indonesia,” no. 2018, 2022.