2 literature references for Porcellio laevissimus Dollfus, 1898B:

Author: Schotte, M., B.F. Kensley, and S. Shilling.
Year: 1995
Title: nwards). World list of Marine, Freshwater and Terrestrial Crustacea Isopoda. National Museum of Natural History Smithsonian Institution: Washington D.C., USA.
Author: Dollfus, A.
Year: 1898
Title: Voyage de M. Gaston Buchet aux Iles Canaries et sur les cotes meridionales du Maroc (1896 & 1897). Isopodes terrestres. Bulletin de la Societe Zoologique de France 23:131-135.