1. Amerom, H. W. J. van, 1972 — Das karbonische Alter der Tiefbohrung Wanneperveen 1, eine Revision. Geologie en Mijnbouw., vol. 51, pp. 491–495.
2. Blanche, J. B., 1973 — The Rotliegendes Sandstone Formation of the United Kingdom sector of the Southern North Sea Basin, Trans. Instn. Min. Metall. (Sect. B. Appl. Earth Sci.), vol, 82, PP. B85–89.
3. Booy, T. de, 1968 — Mineral assemblages in Permo-Carboniferous sediments in the eastern Netherlands. Verh. Kon. Ned. Geol. Mijnbouwk. Genootsch., geol, serie, vol, 25, pp. 21–23.
4. Brouwer, G. C., 1972 — The Rotliegend in the Netherlands. In: Rotliegend, Essays on European Lower Permian, ed, by H. Falke, Brill, Leiden, pp. 34–42.
5. Brueren, J. W. R., 1959 — The stratigraphy of the Upper Permian “Zechstein” formation in the eastern Netherlands. Atti del Convegno di Milano su I Giacimenti Gassiferi dell’ Europa Occidentale, Accademia Nazionale dei Lincei, Roma, vol. I, pp. 243–274.