1. Rajagukguk, J.A and Mosses, R. G. 2022. Conservation of Pine Forest Biodiversity Resources in the Districts. Journal of Diversity in Learning. Vol. 2. No. 1
2. Hutomo, M dan Mohammad K.M. 2005. Indonesian Marine and Coastal Biodiversity: Present Status. Indian Journal of Marine Sciences Vol. 34. No 1. Hal 88–97.
3. Supriatna, J. 2008. Melestarikan Alam Indonesia. Yayasan Obor Indonesia. Jakarta. Hal 15–16.
4. Siahaan, N.H.T. 2004. Environmental law and development ecology. Erlangga Jakarta. Hal 206.
5. Soedjito, H. 2012. Biodiversity and Important Ecosystem Conditions in Sumatra. Minutes of Workshop on Implementation of 5 Sumatra Corridors. Jakarta. Hal 20.