Austin M. Farrer, "On Dispensing with Q" in D. E. Nineham (ed.), Studies in the Gospels: Essays in Memory of R. H. Lightfoot (Oxford: Blackwell, 1955), pp. 55–88, reproduced at http://NTGateway.com/Q/Farrer.htmArchived 2009-02-01 at the Wayback Machine.
markgoodacre.org
See, for example, Michael Goulder's summary of the hypothesis in "Is Q a Juggernaut?", Journal of Biblical Literature 115 (1996): 667-81, reproduced at http://www.markgoodacre.org/Q/goulder.htm.
Austin M. Farrer, "On Dispensing with Q" in D. E. Nineham (ed.), Studies in the Gospels: Essays in Memory of R. H. Lightfoot (Oxford: Blackwell, 1955), pp. 55–88, reproduced at http://NTGateway.com/Q/Farrer.htmArchived 2009-02-01 at the Wayback Machine.