 His primary source was the edition translated to Latin by Ruelle and printed in Alcala in 1518 under supervision of Antonio de Nebrija, but also Ruelle's own classes, which he attended during his stay in Paris between 1530 and 1536.The work was published with the title "Annotations on Dioscorides of Anazarbus" (Lyon, 1554).He also indicates, in his translation, the errors committed by Ruelle that he noticed when collating the Latin translation with various Greek codices.