Cite the VisualDx 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; 2016. URL: //visualdx/visualdx6/getDiagnosisText.do?moduleId=14&diagnosisId=54687&view=text. Accessed January 1, 2016.