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
                                       SEBELUMNYA                          BERIKUTNYA