Acknowledgments

We Gratefully Acknowledge the referees who reviewed paper submited to Jurnal Penelitian Pendidikan IPA (JPPIPA) - Journal of Research in Science Education between July 2018 to January 2019 for Vol. 5 No. 1 January 2019. The list is given below:

1. Retna Apsari, SCOPUS ID: 36020108300, Universitas Airlangga, Department of Physics, Surabaya., Indonesia.
2. Agus Abhi Purwoko, SCOPUS ID : 6603460174, Mataram University, Magister of Science Education, Indonesia.
3. A Wahab Jufri, SCOPUS ID: 57194385050, Mataram University, Magister of Science Education, Indonesia.
4. Ahmad Harjono, SCOPUS ID: 57196086942, Universitas Mataram, Physics Education Study Program, Mataram, Indonesia, Indonesia.
5. Yayuk Andayani, SCOPUS ID : 57195057388, Mataram University, Magister of Science Education, Indonesia.
6. Muhamad Ali, SCOPUS ID: 57199279273, Mataram University, Faculty of Animal Science, Mataram, Indonesia, Indonesia.
7. Abdul Syukur, Mataram University, Magister of Science Education, Indonesia.