[1]
SUSILAWATIS. S., FauziA., KusmanaC., and SantosoN., “Strategy and policy in the management of Sumatran Orangutan (Pongo abelii) conservation tourism on the Lawang Hill in the Langkat district of North Sumatera”, JPSL, vol. 10, no. 1, pp. 1-11, Mar. 2020.