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 10 (January 15, 1987): 174–178. Accessed May 5, 2025. https://dag.revista.uab.cat/article/view/v10-vilagrasa.