by Brown, Steven P., Cron, William L., Slocum, John W.
Published in Journal of marketing (01.10.1998)

by Volk, J.O, Felsted, K.E, Cummings, R.F, Slocum, J.W, Cron, W.L, Ryan, K.G, Moosbrugger, M.C
Published in Journal of the American Veterinary Medical Association (15.01.2005)