Laurence Tribe, American Constitutional Law Third Edition Volume One
Chapter 2 “Model I – The Model of Separated and Divided Powers
In order to grasp our federalism, one must focus not principally on abstract theories or examples from other national charters, but on the peculiar edifice of national and state governments erected by our Constitution- an edifice no less real by virtue of being implicit in the Constitution’s plan rather than explicit in its text. (Page 129)