found: Rousseau, Jean-Jacques. La nouvelle Heloise, ou, Lettres de deux amans, habitans d'une petite ville au pied des Alpes, 1764:v. 1, plate facing page 346 (I. Ouvrier, sculp.)
found: McEachern, J.E. Bibliography of the writings of Jean Jacques Rousseau to 1800. I, Julie ou La nouvelle Heloise, 1993:page 162 (Jean Ouvrier, 1725-1784; French engraver, born and died in Paris)
found: Allgemeines Künstlerlexikon, October 21, 2013(Ouvrier, Jean; copper engraver; graphic artist; born 1725, died 1784; geographical data: Paris, France)
found: Thieme-Becker, via Allgemeines Künstlerlexikon, October 21, 2013(Ouvrier, Jean, engraver in Paris, born 1725, died 1784, pupil of Lebas; book illustrations, vignettes, reproductions of paintings)
found: Bénézit, via Grove Art Online, October 21, 2013(Ouvrier, Jean; French, 18th century, male; born 1725, in Paris; died 1754 [sic; apparently an error for 1784]; engraver (burin); pupil of Lebas; engraved genre subjects and landscapes)
found: VIAF, October 21, 2013:VIAF ID: 39647922 (Personal) (Ouvrier, Jean 1725-1784; Ouvrier, Jean (French engraver, 1725-1784)) VIAF ID: 61712317 (Personal) (Ouvrier, Jean, 1725-1754)
found: ULAN, October 21, 2013(Ouvrier, Jean (French engraver, 1725-1784))
found: BnF authorities, October 21, 2013:FRBNF13561009 (Ouvrier, Jean (1725-1754); burin engraver) FRBNF14063455 (Ouvrier, Jean (1725-1784); engraver)