Syabilla, Yussa Annisa, Ade Suryanda, and Diana Vivanti Sigit. 2018. “A Correlation Between Self Concept and Procrastination Based on Gender in Neuroscience Perspective”. Biosfer: Jurnal Pendidikan Biologi 11 (2):114-20. https://doi.org/10.21009/biosferjpb.v11n2.114-120.