GRÄS, Flemming. Gregers Friisberg: Kommunikation og medier. MedieKultur: Journal of media and communication research, [S. l.], v. 1, n. 1, p. 2 pages, 1985. DOI: 10.7146/mediekultur.v1i1.701. Disponível em: https://www.mediekultur.dk/article/view/701. Acesso em: 12 oct. 2025.