A dictionary or encyclopedia entry is treated in much the same way as a chapter of an edited book, only you do not include page numbers. If the entry has an author, then attribute the entry as per normal. If it does not have an attributed author, the title of the entry jumps into the first position, and is referenced in text instead of an author's name.
Author A.A. (year). Dictionary/Encyclopedia entry. In A. Editor & B. Editor (Eds.), Name of dictionary/encyclopedia (edition, if not the first). Retrieved from URL
Author A.A. (year). Dictionary/Encyclopedia entry. In A. Editor & B. Editor (Eds.), Name of dictionary/encyclopedia (edition, if not the first). City, US State or Country: Publisher.
Dictionary/Encyclopedia entry. (year). In A. Editor & B. Editor (Eds.), Name of dictionary/encyclopedia (edition, if not the first). Retrieved from URL
Güzeldere, G. (2005). Zombies. In L. Nadel (Ed.), Encyclopedia of cognitive science. Retrieved from https://search.credoreference.com/content/entry/wileycs/zombies
Zombie. (2013). In S. Butler (Ed.), The Macquarie dictionary (6th ed.). Retrieved from https://search.credoreference.com/content/entry/macqdict/zombie
Zucchini. (1992). In J. M. Hughes, P. A. Michell and W. S. Ransom (Eds.), The Australian concise Oxford dictionary (2nd ed.). Melbourne, Australia: Oxford University Press.
Zombies are noted to be indistinguishable from humans, apart from certain mental features (Güzeldere, 2005).
A zombie is a corpse "supposedly brought to life" by supernatural forces ("Zombie", 2013).
Zucchinis are a variety of marrow, also known as a corgette ("Zucchini", 1992).
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