Freeman, T.; and Obrador, Antoni. “Paleosoils and coal in the distal part of the Spanish Buntsandstein (Menorca and Mallorca, Balearic Islands)”. Bolletí de la Societat d’Història Natural de les Balears, vol.VOL 23, pp. 47-50, https://raco.cat/index.php/BolletiSHNBalears/article/view/171208.