Conference proceedings are a collection of the papers presented at a conference, symposium, or other meeting. They share many characteristics with citing specific chapters in books. The major difference in citing them lies in their titles and in the provision of information about the dates and places of the conferences in addition to publishing details. Conference proceedings always have a conference title in addition to the title of the paper presented at the conference, and they sometimes have editors of the proceedings. They may also have a unique title in addition to the copnference proceedings series.
United Nations. Dept. for Economic and Social Information and Policy Analysis Population Division. Family planning, health and family well-being. Proceedings of the United Nations Expert Group Meeting on Family Planning, Health and Family Well-Being. Bangalore, India, 26-30 October, 1992. Convened as part of the substantive preparations for the International Conference on Population and Development, 1994. New York: United Nations, 1996.
Note that the date of the conference is different from the date of publication. The conference itself will typically predate publication of the proceedings. It is customary to use the full dates (including days, month/s, and year) of the conference, as opposed to citing just the year of publication (no day/s, month/s).
O'Donoghue, G.M. 2011. Paediatric cochlear implants: challenges and future directions. In: Current Developments & New Directions in Pediatric Audiology. Proceedings of the 4th International Pediatric Conference, Istanbul, 14-15 November. Available: http://www.phonakpro.com/com/b2b/en/events/proceedings/istanbul_2011.html [Accessed 27.12.2012].
Note: in this example, the papaer itself is Paediatric cochlear implants: challenges and future directions. The conference section in which this paper was presented is Current Developments & New Directions in Pediatric Audiology. Use of In: in this example thus helps to clarify the title of the paper from the title of the section in which it was presented. However, it could be left out.
Kahn, M.G., Steib, S.A., Fraser, V.J. & Dunagan, C. An expert system for culture-based infection control surveillance. In: Patient-centred computing, ed. by C.Safran. 17th Annual Symposium on Computer Applications in Medical Care: a conference of the American Medical Informatics Association, Washington, 30 Oct - 3 Nov, 1993. New York: McGraw-Hill, 1994, pp.171-175.
Note: May use first three authors, followed by et al. This paper has a title; the conference proceedings has a title (Patient-centred computing); there is an editor of the published work (Safran); there is a conference series (17th Annual Symposium ...); a sub-title (a conference of the American ...); the date when the conference took place 30 Oct - 3 Nov 1993); and it was published in a particular city (New York) by McGraw-Hill in 1994. It also gives the pages on which this particular paper can be found in this work.
This is about as complicated an example as you are likely to need. The use of In: in this example also helps to clarify the various elements of the citation.