Siegel, S. A. (1960). The law of open space: Legal aspects of acquiring or otherwise preserving open space in the tri-state New York metropolitan region. Regional Plan Association.
Chicago-referens (17:e uppl.)Siegel, Shirley Adelson. The Law of Open Space: Legal Aspects of Acquiring or Otherwise Preserving Open Space in the Tri-state New York Metropolitan Region. New York: Regional Plan Association, 1960.
MLA-referens (9:e uppl.)Siegel, Shirley Adelson. The Law of Open Space: Legal Aspects of Acquiring or Otherwise Preserving Open Space in the Tri-state New York Metropolitan Region. Regional Plan Association, 1960.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.