petrolea
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{{quote-text|en|year=1769|author=William Lewis|title=An Experimental History of the Materia Medica, or of the Natural and Artificial Substances made use of in Medicine|volume=2|edition=3rd|page=143
{{quote-text|en|year=1796|author=Antoine-François de Fourcroy|title=Elements of Chemistry, and Natural History: To which is Prefixed the Philosophy of Chemistry|pages=209–210
{{quote-text|en|year=1956|title=Petro/chem Engineer|page=2
{{quote-text|en|year=1977|title=The Philosophical Magazine|page=212