एपीए उद्धरण

Brown, V. J. (2012). Why is it So Difficult to Choose Safer Alternatives for Hazardous Chemicals? National Institute of Environmental Health Sciences.

शिकागो स्टाइल उद्धरण

Brown, Valerie J. Why Is It So Difficult to Choose Safer Alternatives for Hazardous Chemicals? National Institute of Environmental Health Sciences, 2012.

एमएलए उद्धरण

Brown, Valerie J. Why Is It So Difficult to Choose Safer Alternatives for Hazardous Chemicals? National Institute of Environmental Health Sciences, 2012.