http://repository.uhamka.ac.id/4288/
Mugisidi, Dan
http://repository.uhamka.ac.id/4288/1/1.1.Comparison%20of%20plastic%20and%20stainless-steel%20as%20solar%20still%20material_combine.pdf
http://repository.uhamka.ac.id/4288/2/1.1.PEER%20REVIEW%201_Comparison%20of%20plastic%20and%20stainless-steel%20as%20solar%20still%20material.pdf