Qomar, Nurul, et al. “Stakeholder Analysis in the Implementation of Giam Siak Kecil - Bukit Batu Biosphere Reserve Concept, in Riau Province, Indonesia”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 30, no. 4, Nov. 2016, pp. 53-65, https://gssrr.org/JournalOfBasicAndApplied/article/view/6590.