Title of Dictionary, ed. First name, Surname (if known), number edition. (Location: Publisher, Year of publication), s.v. "Title of Entry,” URL if entry came from online source.
Oxford English Dictionary, 2nd ed. (Oxford: Oxford University Press, 2004), s.v. “Parable.”
NB: It is not necessary to list the Dictionary/Encyclopaedia in your Bibliography unless you have used it more than twice. Note that only the book will be referenced in your Bibliography, not every entry.
Title of Dictionary, ed. First name, Surname (if known), number edition. (Type of Reference e.g. CD-ROM). Location: Publisher, Year of publication. URL if entry came from online source.
Oxford English Dictionary. 2nd ed. Oxford: Oxford University Press, 2004.
1st citation
First name Surname, "Title of Entry," in Title of the Dictionary, ed. First name Surname (City of publication: Publisher, Year), page number(s).
I.H. Marshall, "Parable," in New Bible Dictionary, ed. I.H. Marshall, et al. (Leicester: InterVarsity Press, 1982), 877.
Subsequent citations
Surname, "Title of Entry," page number(s).
Marshall, “Parable,” 878.
Surname, First name. "Title of Entry." In Title of the Dictionary, edited by First name Surname, page numbers of entire chapter. City of publication: Publisher, Year.
Marshall, I.H. "Parable." In New Bible Dictionary, edited by I.H. Marshall, A.R. Millard, J.I. Packer and D.J. Wiseman, 877-79. Leicester: InterVarsity Press, 1982.