Encyclopaedias often contain entries or articles by a collection of authors. Hence, when citing and referencing from Encyclopaedias use the same format as you would when referencing an author’s contributory chapter or article in a book.
FAMILY/SURNAME, Initials. (ed.) or (eds.)-in brackets for editor(s) (Year of publication – in brackets) Title of entry or article. In: Author or Editor of Publication – Surname, Initials with (ed.) or (eds.) – if relevant. Title of Encyclopaedia – in italics. Series title and/or volume – if available. Edition – if not the first. Place of Publication: Publisher.
GHISELIN, M. T. (2001) Darwin, Charles (Darwinism). In: Levin, S. A. (ed.) Encyclopaedia of Biodiversity. Volume 2 D-FI. London: Academic Press.
In-text citation example:
As suggested by Ghiselin (2001)….
‘Direct quotations are placed in single quotations marks’ (Author’s Surname, Year of Publication, p. – followed by page number – in brackets)