EFFENDI, ACHMAD, and MIFTAKHUL JANNAH. 2019. “PENGARUH PELATIHAN SELF-TALK TERHADAP KEPERCAYAAN DIRI ATLET LARI 100 METER”. Character Jurnal Penelitian Psikologi 6 (3). https://doi.org/10.26740/cjpp.v6i3.29164.