TROJANOWSKI , Mariusz. Sales Promotion in Marketing Communications. Psychological Characteristics of the Best Public Speakers. Studia Oeconomica Posnaniensia, Poznan, Polska, v. 6, n. 5, p. 116–129, 2017. DOI: 10.18559/SOEP.2018.5.9. Disponível em: https://journals.ue.poznan.pl/soep/article/view/3819. Acesso em: 3 sep. 2026.