(refer Snooks, p. 201)
In-text citation and reference should be treated as a book or edited book.
Also in the reference provide a description of the document type and if possible the exhibition dates in normal typeface after the title, e.g. exhibition catalogue, 27 March - 10 May 2003
In-Text: (Murray 2003)
References: Murray, K 2003, Haven: the art and
craft of refuge in Tasmania,
exhibition catalogue, 27 March-10 May 2003, Salamanca Arts Centre, Hobart, Tas.
If you cannot find an example for what you are looking for then use: Chapter 12 'Methods of citations' from Snooks (2002)