Bank Street’s mission and credo are on this webpage. There is no author, and no date. Put the title of the page in the author position. Write (n.d.) for the date. Direct your reader to the appropriate section heading which in this case is Credo. Write the full URL.
Bank Street College of Education. (n.d.). Credo. Retrieved from http://bankstreet.edu/discover-bankstreet/what-we-do/mission-credo/
Cite in your text (Bank Street College of Education, n.d.). There is no need to italicize anything in this example.