Books on Amazon
Principle of Sufficient Reason / explanation / ArmstrongVsRationalism /VsSchopenhauer: if we accept the principle then we must accept that laws can be brought under laws of a higher level - then again problem that there is no sufficient reasonfor a higher level law.
AR II = Disp
D. M. Armstrong
Dispositions, Tim Crane, London New York 1996
What is a Law of Nature? Cambridge 1983