?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Devi&rft.aulast=Septianti&rft.au=Septianti%2C+Devi&rft.inst=Universitas+Muhammadiyah+Prof.+DR.+Hamka&rft.title=Analisis+Kemampuan+Memecahkan+Masalah+di+Kelas+XI+MIPA+pada+Materi+Ekosistem&rft.date=2019&rft.degree=Bachelor