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Arndt, W., 1913. Zoologische Ergebnisse der ersten Lehr-Expedition der P. Schottländerschen Jubiläums-Stiftung. Jahresber. Schles. Ges. vaterl. Cultur: 110-136.

Burton, M., 1930a. Norwegian sponges from the Norman collection. Proc. zool. Soc. London, 2: 487-546.

Carter, H.J., 1876. Descriptions and figures of deep-sea sponges and their spicules from the Atlantic Ocean, dredged up on board HMS"Porcupine" chiefly in 1869 (concluded). Annls. Mag. nat. Hist., (4) 18: 307-324.

Lundbeck, W., 1902. Porifera. Part I. Homorrhaphidae and Heterorrhaphidae. Danish Ingolf Exped., 6: 1-108.

Topsent, E., 1904. Spongiaires des Açores. Rés. Camp. sci. Prince Albert Monaco, 25: 1-280, pls. 1-18.

Topsent, E., 1928. Spongiaires de l'Atlantique et de la Méditerranée provenant des croisières de Prince Albert 1er de Monaco. Rés. Camp. sci. Prince Albert Monaco, 74: 1-376, pls. 1-11.

Weerdt, W.H. de, 1985. A systematic revision of the North Eastern Atlantic shallow-water Haplosclerida (Porifera, Demospongiae), Part I: Introduction, Oceanapiidae and Petrosiidae. Beaufortia, 35 (2): 61-91.

Petrosia crassa