NAKBANPOT, W.; HUTACHAROEN, M. A Simplified Carbon Footprint Calculator. Environment and Natural Resources Journal, Nakhon Pathom, Thailand, v. 9, n. 1, p. 6–12, 2017. Disponível em: https://ph02.tci-thaijo.org/index.php/ennrj/article/view/82422. Acesso em: 7 may. 2024.