1.     Arizona University

    https://s3pendmatematika.fmipa.unesa.ac.id/post/forum-group-discussion-with-dr-adiredja-from-mathematics-education-arizona-university

 

    https://s3pendmatematika.fmipa.unesa.ac.id/post/collaborative-research-methodology-and-publication-visiting-lecturer-with-dr-adiredja-from-mathematics-education-arizona-university


2. Universiti Brunei Darussalam

     Invited as External Examineer for PhD Students


3.  Utrecht University, The Netherlands; OkayamaUniversity, Japan; University of Newcastle, Australia; National Institute ofEducation, Singapore; SEAMEO Voctech, Brunei Darussalam; Deakin Uniiversity,Australia; Universiti Brunei Darussalam,Brunei Darussalam 

     SEADR-STEACH 2021: https://seadr-steach.unesa.ac.id/page/keynote-speakers


4.     Universitas Lambung Mangkurat; UniversitasSriwijaya, Indonesia; Universitas Ahmad Dahlan, Indonesia

    SEADR-STEACH 2021: https://seadr-steach.unesa.ac.id/page/keynote-speakers


5.     University of Debrecen, Hungary

    ICOMASEDU : https://s3pendmatematika.fmipa.unesa.ac.id/post/the-international-conference-of-mathematics-science-and-education-icomasedu-2023


6.     Nanyang Technological University, Singapore

    https://s2pendmatematika.pasca.unesa.ac.id/post/internasional-guest-lecture-asstprof-choy-ban-heng-nanyang-technological-university


7.     Sultan Idris Education University, Malaysia;National Yunlin University of Science and Technology, Taiwan

    https://www.youtube.com/watch?v=lEn651QeVP8


8.     UPI, Indonesia

    https://www.youtube.com/watch?v=lEn651QeVP8