1. C. Hallee, https://borgenproject.org/plastic-waste-in-indonesia.
2. Ministry of Environment and Forestry Republic of Indonesia, Work. 2018 Asian Netw. (2018), p. 9.
3. “ThoughtCo.” http://storage.neic.org/event/docs/1129/how_long_does_it_take_garbage_to_decompose.pdf (accessed Aug. 01, 2020).
4. Development and Accuracy Test of a Fused Deposition Modeling (FDM) 3D Printing using H-Bot Mechanism
5. S. Kalpakjian, S. R. Schmid, and K. S. V. Sekar, Manufacturing Engineering and Technology, 7th ed. (Pearson Education South Asia Pte Ltd, Singapore, 2014).