World Register of Marine Species (WoRMS)
Read, G.; Fauchald, K. (Ed.) (2026). World Polychaeta Database. Polyphysia crassa (Örsted, 1843). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=130977 on 2026-08-01
Örsted, A.S. (1843). Annulatorum danicorum conspectus. Auctore A.S. Örsted. Fasc. I. Maricolæ. (Quæstio ab universitate Hafniensi ad solvendum proposita et proemio ornata).
McIntosh, William Carmichel. (1915). Polychaeta, Opheliidae to Ammocharidae. A Monograph of the British Marine Annelids. The Ray Society, London, 3 (1): i-viii, 1-368 (text).
Bidenkap, Olaf. (1895). Systematisk oversigt over Norges Annulata Polychaeta. Forhandlinger fra Videnskabs-Selskabet i Christiania. 1894(10): 1-142, plates I-III. [i.e., volume for 1894, printed the 1st January 1895; see page 142].
Furreg, Erich. 1925. Zur Systematik der Polychätenfamilie Scalibregmidae. Zoologische Jahrbücher, Abteilung für Systematik, Geographie und Biologie der Tiere, 50(2): 123-190.