Hüseyin Akar, Yıldız Burcu Doğan, Mehmet Üstüner 2018. The Relationships between Positive and Negative Perfectionisms, Self-Handicapping, Self-Efficacy and Academic Achievement. European Journal of Contemporary Education. 17, 1 (Feb. 2018). DOI:https://doi.org/10.13187/ejce.v17i 1 .167.