The In-text citation and reference for an exhibition catalogue should be treated as a book or edited book.
Also in the reference, provide a description of the document type. If possible, add the exhibition dates in normal typeface after the title, e.g. exhibition catalogue, 11 March - 27 November, 2011
(Di Trocchio 2011)
Di Trocchio, P 2011, Manstyle : men + fashion, exhibition catalogue, 11 March-27 November,
National Gallery of Victoria, Melbourne, Vic.