All Historical Photos. 1870-1950. Photograph. New York Public Library Digital Gallery.NYPL Digital Gallery. Web. 3 Oct. 2010. <http://digitalgallery.nypl.org/nypldigital>.
Berenson, Richard J. The Complete Guidebook to Prospect Park and the Brooklyn Botanic Gardens. New York: Silver Lining, 2001. 2001. Web. <http://books.google.com/books?hl=en&lr=&id=xDkdA2Yi7swC&oi=fnd&pg=PA6&dq=%22prospect+park%22+brooklyn&ots=FMYwb3GmmT&sig=peFV-g3jga1lwXtfPAcENqYQFNw#v=onepage&q&f=false>.
Fein, Albert. “Urban Design: The Bridge and Prospect Park.” Brooklyn Museum (1983).Www.brooklynmuseum.org. Web. <https://www.brooklynmuseum.org/research/digital-collections/brooklynbridge/pdf/GERB_07_Urban%20Design_The%20Bridge%20and%20Prospect%20Park.pdf>.
Lancaster, Clay. Prospect Park Handbook. New York: Published for Greensward Foundation [by] Long Island UP, 1972. Print.
Matteson, Kevin C., John S. Ascher, and Gail A. Langellotto. “Bee Richness and Abundance in New York City Urban Gardens.” Annals of the Entomological Society of America 101.1 (2008): 140-50. NioOne Online Journals, 5 Oct. 2007. Web. <http://www.bioone.org/doi/abs/10.1603/0013-8746(2008)101%5B140:BRAAIN%5D2.0.CO%3B2>.
Murphy, Joseph C. “Distant Effects: Whitman, Olmsted, and the American Landscape.”Mickle Street Review 17/18 (2005). Web. <http://micklestreet.rutgers.edu/archives/Issue%201718/pages/Scholarship/Murphy.htm>.
Schuyler, David. “Cities and Parks: Brooklyn, Transformation: The Neoclassical Cityscape.” The New Urban Landscape: the Redefinition of City Form in Nineteenth-century America. Baltimore: Johns Hopkins UP, 1986. Web. <http://faculty.washington.edu/chalana/urbdp565/schuyler_binder.pdf>.
Schwartz, Anne. “In 1980, Prospect Park Lay in Shambles. Now, after Carefully Researched Restoration, It Looks Almost as If Olmsted and Vaux Had Designed It Yesterday.” Landscape Architecture Journal July (2003). Www.asla.org. July 2003. Web. <http://www.www.asla.org/lamag/lam03/july/feature2.html>.
Journal of Forest History
Vol. 33, No. 3 (Jul., 1989), pp. 134-143
Published by: Forest History Society and American Society for Environmental History
Vol. 39, No. 4 (Winter, 1987), pp. 529-550
Published by: The Johns Hopkins University Press
“New York Architecture Images- Prospect Park.” Nyc-architecture | New York
Architecture- Historic and Contemporary. Web. 01 Oct. 2010. <http://www.nyc-architecture.com/BKN/BKN006.htm>.
Liu, Cheng, Jordan, and Doan. “The Role of Municipal Water Ortho-Phosphate on
Eutrophication at Prospect Park, Brooklyn, New York.” He Smithsonian/NASA Astrophysics Data System. Web. 01 Oct. 2010. <http://adsabs.harvard.edu/abs/2008AGUSM.B41A..08L>.
“Frederick Law Olmsted Sr.” National Association for Olmsted Parks. Web. <http://www.olmsted.org/ht/d/sp/i/1162/pid/1162>.
“Dusan Writer’s Metaverse » Prospect Park.” Dusan Writer’s Metaverse. 07 June 2010. Web. 02 Nov. 2010. <http://dusanwriter.com/index.php/2010/06/17/prospect-park/>.
“Olmsted & Vaux.” Prospect Park Home. Prospect Park Alliance. Web. 08 Nov. 2010. <http://www.prospectpark.org/visit/history/architects>.
Good sources, but you need to use a standard format. Articles and books that exist in a print form do not require a web site to be cited, particularly if the web citation is just an online database.
Jason