Distinguish with an (a), (b), (c) as necessary. Alphabetize by date (if available) or by web page title.

Example:

WSU Small Farms Team n.d. (a). Composting. Washington State University. smallfarms.wsu.edu/soils-compost/composting.html.

——— n.d. (b). Drip Irrigation. Washington State University. smallfarms.wsu.edu/crops/irrigation/index.html.