M. Clarich., Manual of administrative law, 3rd ed. , il Mulino, Bologna, 2017.
Chapters: II, III, V, VI, VII, VIII, of chap. XIV from p. 471 on p. 478.
G. Napolitano, The logic of administrative law, 2nd ed., Il Mulino, Bologna, 2017.
B.G. Mattarella, Lectures on administrative law, G. Giappichelli Editore, Turin, 2018,
Part I and II (from p.3 to p.96); Part IV and V (p. 159 to 255).
Recommended reading: S. Cassese, European legal order and national order, in Giorn. dir. admin., 2010, fs. 4, from p. 419 to 422.