AUTHOR(S) (Year) Title. In: Title of conference proceedings. Place and date of conference (unless included in title). Place of publication: Publisher, Pages, use p. or pp.
e.g. HUFFMEYER, M. and SCHREIER, U. (2016) RestACL: An access control language for RESTful services. In: Proceedings of the 2016 ACM International Workshop on attribute Based Access Control, New Orleans, March 2016. New York: ACM, pp. 58-67.