Book Review: Methodenlehre des Unionrechts, by Sebastian A. E. Martens. (Tübingen: Mohr Siebeck, 2013) - Common Market Law Review View Book Review: Methodenlehre des Unionrechts, by Sebastian A. E. Martens. (Tübingen: Mohr Siebeck, 2013) by - Common Market Law Review Book Review: Methodenlehre des Unionrechts, by Sebastian A. E. Martens. (Tübingen: Mohr Siebeck, 2013) 52 5 Common Market Law Review