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Sagala, Nurdeli Lasniroha and Rahmatsyah, and Simanjuntak, Mariati Purnama (2017) The Influence of Problem Based Learning Model on Scientific Process Skill and Problem Solving Ability of Student. IOSR Journal of Research & Method in Education (IOSR-JRME), 7 (4). 01-09. ISSN e- ISSN: 2320–7388,p-ISSN: 2320–737X
Sagala, Nurdeli Lasniroha (2017) PENGARUH MODEL PROBLEM BASED LEARNING TERHADAP KETERAMPILAN PROSES SAINS DAN PEMECAHAN MASALAH. Masters thesis, UNIMED.