Wulandari, B.C., Rusilowati, A. and Saptono, S. 2019. The Development of Performance Assessment Instrument Integrated 4C for Measuring Science Process Skills in the Science Experiments of Elementary School Students. Journal of Primary Education. 8, 8 (Oct. 2019), 233-241. DOI:https://doi.org/10.15294/jpe.v10i2.34456.