KRISTENSEN, B. B.; MADSEN, O. L.; NYGAARD, K. BETA Language Development: Survey Report, 1. November 1976. DAIMI Report Series, [S. l.], v. 6, n. 65, 1977. DOI: 10.7146/dpb.v6i65.6483. Disponível em: https://tidsskrift.dk/daimipb/article/view/6483. Acesso em: 9 may. 2024.