1. E. B. Magwilang, Int. J. Learn. Teach. Educ. Res. 15(4), 60–68 (2016).
2. S. Faraday C. Overton and S. Cooper, "Current Interest of Pedagogy" in How to teach vocational education: A theory of Vocational Pedagogy, edited by B. Lucas, E. Spencer, and G. Claxton. (Centre for Real-Word Learning, University of Whinchester, Whinchester, England, 2012), pp. 14–16.
3. R. M. Capraro, M. M. Capraro, and J. R. Morgan, J. R, STEM project-based learning an integrated science, technology, engineering, and mathematics (STEM) approach (Sense Publishers, Rotterdam, 2016), pp 3–9.
4. Febrianto, and A. Wiyarsi, Bahan ajar kimia hidrokarbon dan minyak bumi untuk sekolah menengah kejuruan (SMK) teknik otomotif (UNY Press, State University of Yogyakarta, Yogyakarta, 2018), pp 2–50.
5. Vocational High School Students Chemical Literacy on Context-Based Learning: A Case of Petroleum Topic