CSE reference list example. Online map: name-year. [area of map] Northeastern United States. [publication date, followed by period] 2001 Jun 1. [title of map, followed by descriptive label in brackets and a period] West Nile virus: wild bird cases [demographic map on the Internet]. [place of publication, followed by colon] Washington (D C): [publisher, followed by semicolon] Department of the Interior (U S). [the word “cited” and the access date in brackets, followed by semicolon] [cited 2005 Jun 22]; [size in brackets, followed by semicolon and physical description followed by period] [1 screen]; color. [words “Available from,” a colon, and the URL] Available from: http://nationalatlas.gov/printable/wnv.html