"Entreprise Stemyla" [Company Stemyla] (in French). Manageo. Retrieved 4 February 2019. "David Grondin". BFM Business (in French). Retrieved 4 February 2019.
"David Grondin". L'Équipe (in French). Paris. Retrieved 4 February 2019.
manageo.fr
"Entreprise Stemyla" [Company Stemyla] (in French). Manageo. Retrieved 4 February 2019. "David Grondin". BFM Business (in French). Retrieved 4 February 2019.