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Farida, Ida and Liliasari, L and Sopandi, W and Widyantoro, D.H (2017) A web-based model to enhance competency in the interconnection of multiple levels of representation for pre-service teachers. Ideas for 21st Century Education . Taylor & Francis Group, London. ISBN 978-1-138-05343-4
Farida, Ida and Liliasari, - and Widyantoro, DH and Sopandi, W (2010) Representational Competence’s Profile of Pre-Service Chemistry Teachers in Chemical Problem Solving. In: 4th International Seminar of Science Education, Bandung, 30 Oktober 2010, Bandung.
Farida, Ida and Liliasari, L and Widyantoro, D.H and Sopandi, W (2009) The Importance of Development of Representational Competence in Chemical Problem Solving Using Interactive Multimedia. Proceeding of The Third International Seminar on Science Education. pp. 259-277. ISSN 978-602-8171-14-1
