Author, A. A. (Year). Title of entry. In A. Editor (Ed.), Title of reference work (xx ed.). Website. http://xxxxx
Masolo, D. (2006). African sage philosophy. In E. N. Zalta (Ed.), The Stanford encyclopedia of philosophy (Fall 2008 ed.). Stanford University. http://plato.stanford.edu/entries/african-sage/
As in-text citation:
(Masolo, 2006)
United States Holocaust Memorial Museum. (n.d.) Antisemitism. In Holocaust encyclopedia. Retrieved October 7, 2019, from https://encyclopedia.ushmm.org/content/en/article/antisemitism
As in-text citation:
(United States Holocaust Memorial Museum, n.d.)
Note: If the author is the same as the website, omit the website component. If an encyclopedia is continuously updated and does not have an archived version, include the retrieval date.
Source: Publication Manual, 10.3 (examples 47-48)