Marino, A. de 1980. Sandstones and phosphatized calcareous sediments of the Lower Cambrian Rispebjerg Sandstone, Bornholm, Denmark. Danmarks Geologiske Undersøgelse II. Række. 113, (Dec. 1980), 1–39. DOI:https://doi.org/10.34194/raekke2.v113.6904.