When citing a web resource, use:
Example:
1. Dudoit S, Yang YH, Callow MJ, Speed TJ. Statistical methods for identifying differentially expressed genes in replicated cDNA microarray experiments [Online]. Dept. of Statistics, Univ. of California at Berkeley. http://www.stat.berkeley.edu/users/terry/zarray/Html/matt.html [3 Sept. 2000].
2. Friedman N, Linial M, Nachman I, Peter D. Using Bayesian networks to analyze expression data [Online]. Stanford University. http://robotics.stanford.edu/people/nir/Abstracts/FLNP1Full.html [2000].