K. Dajnoki, G. N. Szabados, Z. Bács, Éva Bácsné Bába, and P. M. Kőmíves, “Sport, nonprofit and civil organisations: The investigation of employment and volunteering in Hungary and in Romania”, RSZ, vol. 6, no. 1, pp. 90–101, May 2023, doi: 10.30716/RSZ/21/1/8.