?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aulast=Saputra&rft.au=Saputra%2C+Rollan+Isvan&rft.aufirst=Rollan+Isvan&rft.inst=Universitas+Negeri+Padang&rft.date=2018&rft.degree=Bachelor%2FSkripsi&rft.title=Analisis+Sistem+Pembelian+Bahan+Baku+Karet+pada+PT.+Perkebunan+Nusantara+VI