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References from TOXLINE and DART can follow either the journal article citation rules in the author instructions for a specific journal or your particular requirements.
 
The citation format preferred by NLM for databases such as HSDB, IRIS, ITER, GENE-TOX, and CCRIS is shown below:
 
Format Template: MeSH Browser [Internet]. Bethesda (MD): National Library of Medicine (US); 2001- [updated 2001 Apr 5; cited 2001 Apr 10]. Meta-analysis; unique ID: D015201; [about 3 p.]. Available from: http://www.nlm.nih.gov/mesh/MBrowser.html
 
Example: Hazardous Substances Data Bank [Internet]. Bethesda (MD): National Library of Medicine (US); [Last Revision Date ????; cited 2011 Mar ]. Potassium Nitrate; Hazardous Substances Databank Number: ???; [about # screens]. Available from: http://toxnet.nlm.nih.gov/cgi-bin/sis/htmlgen?HSDB
 
The Hazardous Substances Databank Number is found in the Administrative Information section of an HSDB record.
The Last Revision Date is found in the Administrative Information section of an HSDB record.