The VisualDX corporate recommendation does not necessarily follow the citation style guidelines that you may need for your class assignments or for publication of a manuscript or book. Please consult the appropriate style guide to cite each topic as a chapter in an electronic book titled VisualDx with editor Lowell A. Goldsmith. There are no page numbers, and publication year should be the current year.
Papier A, Craft N, Tharp MD, Shear N. Cocaine Levamisole Toxicity. In: Goldsmith LA, ed. VisualDx. Rochester, NY: VisualDx; 2013. URL: http://www.visualdx.com/visualdx/visualdx6/getDiagnosisText.do?moduleId=14&diagnosisId=54687&view=text. Accessed October 29, 2013.