HELTOFT, Lars. Offentlighed og Public Relations. MedieKultur: Journal of media and communication research, [S. l.], v. 9, n. 20, p. 6 pages, 1993. DOI: 10.7146/mediekultur.v9i20.964. Disponível em: https://www.mediekultur.dk/article/view/964. Acesso em: 12 oct. 2025.