dAfTAr pUsTAKA
https://www.academia.edu/5256067/SISTEM_INFORMASI_UNTUK_KEUN
GGULAN_KOMPETITIF
https://binus.ac.id/bits/learning-object/What-is-Porter-Five-Forces-
325/index.html#/the-power-of-buyer
https://www.businessnewsdaily.com/5446-porters-five-forces.html
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