Author's Last Name, First Name. Year. "Title of Entry in Title Case." In Title of Encyclopedia in Italic Title Case, edition, edited by Editor's First Name Last Names, page numbers. Place of Publication: Publisher. URL or DOI (formatted as https://doi.org/10####)
Howitt, R., S. Muller, and S. Suchet-Pearson. 2009. "Indigenous Geographies A2." In International Encyclopedia of Human Geography, edited by Rob Kitchin and Nigel Thrift. Oxford: Elsevier. https://doi.org/10.1016/B978-008044910-4.00705-7.
...(Howitt, Muller and Suchet-Pearson 2009).
OR
Howitt, Muller and Suchet-Pearson (2009) ...
Title of Dictionary/Encyclopedia in Italics Title Case. Year. Edition., s.v. "Titlle of Entry in Title Case." Place of Publication: Publisher. URL
West's Encyclopedia of American Law. 2005. 2nd ed., s.v. "North Atlantic Treaty Organization." Detroit: Thompson Gale.
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... (West's Encyclopedia of American Law 2005).
West's Encyclopedia of American Law (2005) ...