VILAGRASA I IBARZ, Joan. BAKER, Alan R. H. ; BILLINGE, Mark. Period and place. Research methods in historical Geography. BAKER, Alan R. H. ; GREGORY, Derek. Explorations in historical Geography. Documents d’Anàlisi Geogràfica, [S. l.], v. 10, p. 174–178, 1987. DOI: 10.5565/rev/dag.1407. Disponível em: https://dag.revista.uab.cat/article/view/v10-vilagrasa. Acesso em: 5 may. 2025.