Wulandari, Betti Cahya, Ani Rusilowati, and Sigit Saptono. 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), 233-41. https://doi.org/10.15294/jpe.v10i2.34456.