Simply add the link at the end of your citation. Or am I misunderstanding your question? For example:
Smith, R. L. (1997). Philosophical shift: Teach the faculty to teach information literacy. ACRL 8th National Conference, Choosing Our Futures, Nashville, TN, April 11 - 14, 1997. http://www.ala.org/acrl/publications/whitepapers/nashville/smith