Abdul Wahab, Muzamir Hassan, Zaheer Ud Din, and Qamar Uz Zaman, “Heavy metals concentration in undisturbed peat soil at Pekan District, Pahang, West Malaysia”, Maejo Int. J. Energ. Environ. Comm. or MIJEEC, vol. 3, no. 2, pp. 23–31, Aug. 2021.