http://repository.uhamka.ac.id/id/eprint/17200/
How do Indonesian
elementary school
mathematics textbooks
introduce fractions
ishaq, nuriadin
http://repository.uhamka.ac.id/id/eprint/17200/1/5.%20How%20do%20Indonesian%20elementary%20school%20mathematics%20textbooks%20introduce%20fractions%20similarity.pdf