| The Internationalization of Teacher Education: Different Contexts, Similar Challenges. B Leutwyler, N Popov, C Wolhuter Bulgarian Comparative Education Society, 2017 | 35 | 2017 |
| Comparative education at universities world wide C Wolhuter, N Popov, M Manzon, B Leutwyler Bureau for Educational Services, 2008 | 35 | 2008 |
| School Counseling: A Comparative Study in 12 Countries. N Popov, V Spasenovic Bulgarian Comparative Education Society, 2020 | 27 | 2020 |
| Implementation the project of distance learning in faculty of public health N Popov, N Shtereva-Nikolova, K Lyubomirova International Journal on New Trends in Education and Their Implications 6 (1 …, 2015 | 25 | 2015 |
| Bulgaria N Popov The Education Systems of Europe, 147-165, 2007 | 16 | 2007 |
| History of Bulgarian comparative education N Popov Comparative education at universities world wide, 95-110, 2007 | 14 | 2007 |
| New challenges to education: Lessons from around the world N Popov, C Wolhuter, L De Beer, G Hilton, J Ogunleye, ... Bulgaria: BCES Conference Books. Available online also at: https://files …, 2021 | 12 | 2021 |
| The Bulgarian Comparative Education Society (BCES) N Popov Common interests, uncommon goals: Histories of the world council of …, 2008 | 11 | 2008 |
| Clinical studies on endemic nephropathy in Bulgaria A Puchlev, N Popov, A Astrug, D Dotchev International Symposium on Endemic Nephropathy, 17-24, 1963 | 11 | 1963 |
| An introduction to comparing comparative methodologies: A framework for understanding pitfalls and operationalizing promises AW Wiseman, N Popov Comparative sciences: Interdisciplinary approaches 26, 1-11, 2015 | 10 | 2015 |
| Quality, Social Justice and Accountability in Education Worldwide. BCES Conference Books, Volume 13. Number 1. N Popov, C Wolhuter, KS Ermenc, G Hilton, J Ogunleye, E Niemczyk Bulgarian Comparative Education Society, 2015 | 10 | 2015 |
| Feminism as a political ideology N Popov International conference Knowledge-Based Organization 24 (2), 373-376, 2018 | 9 | 2018 |
| Stručni saradnik u školi: komparativni pregled za 12 zemalja N Popov, V Spasenović Sofija: Bugarsko društvo za komparativnu pedagogiju, 2018 | 9 | 2018 |
| Comparative education in Bulgaria N Popov Comparative education at universities world wide, 29-36, 2013 | 9 | 2013 |
| Mosaic of comparative education at universities: Conceptual nuances, global trends and critical reflections C Wolhuter, N Popov, M Manzon, B Leutwyler Comparative education at universities world wide, 319-342, 2008 | 9 | 2008 |
| Structures of School Systems Worldwide: A Comparative Study. N Popov Bulgarian Comparative Education Society, 2012 | 8 | 2012 |
| Current Business and Economics Driven Discourse and Education: Perspectives from around the World. BCES Conference Books, Volume 15. N Popov, C Wolhuter, J Kalin, G Hilton, J Ogunleye, E Niemczyk, ... Bulgarian Comparative Education Society, 2017 | 7 | 2017 |
| Comparative pedagogy in slavonic south east european countries KS Ermenc, V Spasenović, N Vujisić-Živković, S Vrcelj, N Popov Annual Review of Comparative and International Education 2013, 191-218, 2013 | 7 | 2013 |
| Clinical studies on endemic nephrities A Puchlev, A Astrug, N Popov, D Dotchev Endemic Nephritis in Bulgaria; Medizina I Fizkultura. Sofia, 7-71, 1960 | 7 | 1960 |
| Professional associate in school: comparative review for 12 countries N Popov, V Spasenović Prvo izdanje, Izdavač Bulgarian society for comparative pedagogy, Sofia, 2018 | 5 | 2018 |
