?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Sela&rft.au=Ardelia%2C+Sela&rft.aulast=Ardelia&rft.date=31+October+2019&rft.inst=Universitas+Prof.Dr.+Hamka&rft.degree=Bachelor&rft.title=PENGARUH+STRATEGI+PEMBELAJARAN+PQ4R+TERHADAP+PEMAHAMAN+KONSEP+BELAJAR+SISWA+MATERI+EKOSISTEM