Book excerpt: The contributions of Understanding the Sources of Early Modern and Modern Commercial Law: Courts, Statutes, Contracts, and Legal Scholarship show the wealth of sources which historians of commercial law use to approach their subject. Depending on the subject, historical research on mercantile law must be ready to open up to different approaches and sources in a truly imaginative and interdisciplinary way. This, more than many other branches of law, has always been largely non-state law. Normative, ‘official’, sources are important in commercial law as well, but other sources are often needed to complement them. The articles of the volume present an excellent assemblage of those sources. Anja Amend-Traut, Albrecht Cordes, Serge Dauchy, Dave De ruysscher, Olivier Descamps, Ricardo Galliano Court, Eberhard Isenmann, Mia Korpiola, Peter Oestmann, Heikki Pihlajamäki, Edouard Richard, Margrit Schulte Beerbühl, Guido Rossi, Bram Van Hofstraeten, Boudewijn Sirks, Alain Wijffels, and Justyna Wubs-Mrozewicz.