MRUK, Henryk. The Principles of Marketing Management in Social Organizations. Studia Oeconomica Posnaniensia, Poznan, Polska, v. 3, n. 7, p. s. 177–189, 2015. DOI: 10.18559/2wz8rx18. Disponível em: https://journals.ue.poznan.pl/soep/article/view/3981. Acesso em: 3 sep. 2026.