Želvys, Rimantas. “Producers, Distributors, Users and Quality of Services in Education”. Acta Paedagogica Vilnensia 9 (December 20, 2002): 303–310. Accessed October 25, 2025. https://test.zurnalai.vu.lt/acta-paedagogica-vilnensia/article/view/9565.