*[http://www.theplantlist.org/tpl1.1/search?q=Hopea+helferi Plant List]
*[http://pfaf.org/user/Plant.aspx?LatinName=Hopea%20helferi Plants for a future]
*[http://proseanet.org/prosea/e-prosea.php [Hopea helferi (PROSEA)|PROSEA on Pl@ntUse]]
*[http://www.tela-botanica.org/page:eflore_bdtfx?referentiel=bdtfx&niveau=2&module=fiche&action=fiche&type_nom=nom_scientifique&nom=Hopea%20helferi Tela Botanica]
*[http://tropical.theferns.info/viewtropical.php?id=Hopea%20helferi Useful Tropical Plants Database]
*[https://fr.wikipedia.org/wiki/Hopea%20helferi Wikipédia]
*[http[Category://www.wikiphyto.org/wiki/Hopea%20helferi Wikiphyto]]