?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Hasnul&rft.aulast=Rijal&rft.au=Rijal%2C+Hasnul&rft.inst=Universitas+Negeri+padang&rft.title=Kontribusi+Perilaku+Asertif+terhadap+Prokrastinasi+Akademik+Siswa+di+SMP+Negeri+39+Padang&rft.degree=Bachelor%2FSkripsi&rft.date=July+2018