Visi 2 Ilana Arnon izlaidumi pie Paperback Book un H... Book
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![Cover for Ilana Arnon · APOS Theory: A Framework for Research and Curriculum Development in Mathematics Education (Paperback Book) [Softcover reprint of the original 1st ed. 2014 edition] (2015)](https://imusic.b-cdn.net/images/item/original/255/9781489998255.jpg?ilana-arnon-2015-apos-theory-a-framework-for-research-and-curriculum-development-in-mathematics-education-paperback-book&class=scaled&v=1483904974)
![Cover for Ilana Arnon · APOS Theory: A Framework for Research and Curriculum Development in Mathematics Education (Hardcover Book) [2014 edition] (2013)](https://imusic.b-cdn.net/images/item/original/659/9781461479659.jpg?ilana-arnon-2013-apos-theory-a-framework-for-research-and-curriculum-development-in-mathematics-education-hardcover-book&class=scaled&v=1612628960)