When citing multiple pages from an organization’s Web site, the reference entry should use the exact URL for each page. Because each in-text entry would have the same author/organization and year, you will need to add a lowercase letters to the year to distinguish citations for each page. Letters are assigned in the order that the citations are used in the text.
The examples below are different pages from North Carolina (NC )Division of Social Services Web site that would all be cited as (NC Division of Social Services, 2010). A lowercase letter is added to in-text citation and the corresponding reference entry. If you choose to abbreviate the source, you’ll need to define the abbreviation only once and then apply to all:
(North Carolina Division of Social Services [NCDSS], 2010a)
North Carolina Division of Social Services. (2010a). Role & responsibilities of CSE agency. Retrieved from http://www.ncdhhs.gov/dss/cse/geninfo.htm#role
North Carolina Division of Social Services. (2010b). Work First. Retrieved from http://www.ncdhhs.gov/dss/workfirst/index.htm
North Carolina Division of Social Services. (2010c). Low income energy assistance program. Retrieved from http://www.ncdhhs.gov/dss/energy/index.htm