TThe concept "valid law"The concept "valid law"de Aleksander PeczenikMateriasEffectiveness and validity of lawEdiciones (1)The concept "valid law" (1972)Almqvist & Wiksell · inglésMás obras de Aleksander PeczenikOn Law and ReasonA treatise of legal philosophy and general jurisprudenceRReasoning on legal reasoningReasoning on legal reasoning