Citation of electronic sources require authors , reviewers and publishers of scholarly articles to know technical details about the many kinds of online sources possible, and they must know how to apply and interpret the highly variable formats given in electronic and internet citation guides. “Citing Medicine” the NLM style Guide for Authors, Publishers, and Editors – is considered as a standard source for many biomedical researches and publishers in citation process of their work. This presentation is based mainly on this valuable source and using only the last chapters –22 through 26- that dealing with citation styles of internet resources