4 1 10 Olaf Zawacki-Richter Primary Author Insung Jung Additional Author mixed material 9789811920806 Singapore Springer 2023 Handbook of Open, Distance and Digital Education cover_handbook-of-open-distance-and-digital-education-20230404155317.png Adnan Qayyum Primary Author Olaf Zawacki-Richter Additional Author mixed material 9789811302985 Switzerland Springer Cham 2018 Open and Distance Education in Australia, Europe and the Americas cover_open_and_distance_education_in_australia_europe_and_the_americas.jpg Olaf Zawacki-Richter Translator Adnan Qayyum Additional Author mixed material 9789811357879 Singapore Springer Singapore 2019 Open and Distance Education in Asia, Africa and the Middle East cover_open_and_distance_education_in_asia_africa_and_the_middle_east.jpg Olaf Zawacki-Richter Primary Author Michael Kerres Additional Author Svenja Bedenlier Additional Author Melissa Bond Additional Author Katja Buntins Additional Author mixed material 9783658276027 Germany Springer VS Wiesbaden 2019 Systematic Reviews in Educational Research cover_systematic_reviews_in_educational_research.jpg