'This excellent addition to the 'Cambridge Companions to Law' series [...] plays a critical role in grounding legal positivism within current trends and reaffirming its continued relevance ... Under the keen editorial guidance of Spaak (Stockholm Univ.) and Mindus (Uppsala Univ.), the logical organization, caliber of contributors, and emphasis on demonstrating the current relevance of legal positivism all come together to make this an essential volume for both students and scholars.' L. A. Wilkinson, Choice