1. W.H. Barber, and M.R.D. Summerfield, 1990 . Environmental control of bacterial blotch on Pennsylvania shelf farms., Environmental control of bacterial blotch on Pennsylvania shelf farms., 38 (2 ):8 -17 .
2. C.L. Barden, 1987 . The effect of calcium chloride added to the irrigation water on the shelf life and quality of harvested mushrooms (Agaricus bisporus) . M.S. thesis , The Pennsylvania State University, University Park, PA.