AFRINAWATI. THE EFFECT OF STUDENTS’ ATTITUDE AND PORTFOLIO ASSESSMENT TOWARDS THE ACHIEVEMENT OF STUDENTS’ SCIENCE PROCESS SKILL. JEP [Internet]. 2013 Mar. 30 [cited 2024 Nov. 22];4(1):12-24. Available from: https://journal.unj.ac.id/unj/index.php/jep/article/view/2717