CSE Style: When you use data in the CSE citation-sequence system, you need to put a number at the end of the sentence. This number corresponds to a citation in your list of references that will show the reader where you found the information. Example and lots of help with citing sources: CSE Citation Guide
Online Sources: Professor Walsh would like online sources to be referenced in the following manner:
Author(s) if applicable. Title if applicable. Name of website or journal title if electronic journal*. [Year/month source last updated; year/month you accessed site]; if online journal article give volume (issue): page numbers. Available from: http://www.url.