Citazione APA

Groot, G. E. d. (1963). Rugose corals from the Carboniferous of northern Palencia (Spain). Druk van J.J. Groen.

Stile di citazione Chicago

Groot, G. E. de. Rugose Corals from the Carboniferous of Northern Palencia (Spain). Leiden: Druk van J.J. Groen, 1963.

Citazione MLA

Groot, G. E. de. Rugose Corals from the Carboniferous of Northern Palencia (Spain). Druk van J.J. Groen, 1963.