POGO: Partnership for Observation of the Global Ocean, meer
Larsen, P.F. 2009. A Historical Record of Sponges, Bryozoa and Ascidians on the Coast of Maine:1843-1980. Bigelow Laboratory for Ocean Sciences Tech. Rept. 200905. West Boothbay Harbor, Maine., meer
Larsen, P.F., A.C. Johnson and A. Pugh. 2010. The Macrobenthos of Penobscot Bay, Maine. Bigelow Laboratory for Ocean Sciences. Consulted on http://www.iobis.org on, meer
Larsen, P.F., A.C. Johnson. L.F. Dogget and A. Pugh. 2009. Environmental Benchmark Studies in Casco Bay - Portland Harbor, Maine, April 1980. NOAA Technical Memorandum NMFS-F/NEC-19. 173 pp., meer
