Format: 

Lastname, Firstname. "Title of Entry." Title of Work, edited by FirstName LastName, volume, Title of Website, Publisher, Year, Page(s). Database Name or Title of Non-Publisher Website, DOI or URL. Accessed Day Month Year.

Lastname, Firstname. "Title of Entry." Title of Work, edited by FirstName LastName, volume, Title of Website, Publisher, Year, Page(s). Database Name or Title of Non-Publisher Website, DOI or URL (when accessed from the publisher's website). Accessed Day Month Year.

Lastname, Firstname. "Title of Entry." Title of Work, edited by FirstName LastName, volume, Title of Website, Publisher, Year, Page(s).

Examples: 

"Sustainability." Oxford English Dictionary, 3rd ed., Oxford UP, Mar. 2012, www.oed.com.ezproxy.rit.edu/view/Entry/299890?redirectedFrom=Sustainabil.... Accessed 2 Oct. 2017.

In-text: (Sustainability def. 2)

"The Walking Dead (TV Series)." Wikipedia, the Free Encyclopedia, 28 Sept. 2017, en.m.wikipedia.org/wiki/The_Walking_Dead_(TV_series). Accessed 2 Oct. 2017.

In-text: ("The Walking Dead")

Jackson, Matt. "Copyright." Encyclopedia of Communication and Information, edited by Jorge Reina Schement, vol. 1 Macmillan Reference, 2002, pp. 193-196. GAle Virtual Reference Library, go.galegroup.com.ezproxy.rit.edu/ps/i.do?id=GALE%7C0PFK&v=2.1&u=roch82189&it=aboutBook&p=GVRL&sw=w&authCount=1.

In-text: (Jackson 15)

Notes: 

Citing an entry in a reference work is similar to citing a chapter in a book. For electronic sources you should also provide a DOI (Digital Object Identifier) if available; otherwise, provide the direct URL for the item, but omit the http:// or https:// (MLA 110). For instances where you do not include an author or an editor, only include the first word or noun phrase (noun and any preceding adjectives) of the title in the in-text citation (see first and second example) (MLA 118). If you do not have page numbers, but there is another numbering system used (e.g. definition number), you may include that in the in-text citation along with the appropriate abbreviation (MLA 56); otherwise, only include the author or title in the in-text citation. For collaboratively edited sites such as Wikipedia the inforamtion may change frequently so provide an access date (MLA 53); access dates are less necessary for electronic copies of published works such as scholarly encyclopedias. If the publisher is sufficiently identified by the title of the website, you can omit the publisher (see first example) (MLA 42).

Source:
MLA - pp. 27, 36