Juillard, Patrick Keywords: Foreign direct investment | Sources of law | Law | Mots clefs: Investissement | Sources | Droit | ABSTRACT In this course, Patrick Juillard, Professor at the Univeristy of Paris I, does not investigate the evolution of investment law as such, but rather at the evolution of the sources of investment law. The course is split in two unequal parts, explains Professor Juillard, because after all, and from a chronological point of view, they cover two periods of unequal importance. Indeed, as th…