1. L. Lombardi Vallauri, 1967, Ch III, pp. 217–220.
2. Criticism of Begriffsjurisprudenz by S. Ehrlich, 1918, p. 130ff; 1913 p. 25 3ff ; E. Fuchs, 1912, Ch II; on opposition between Interessenjurisprudenz and Begriffsjurisprudenz P. Heck, 1933, p. 3ff; J. Stone, 1964, Ch 6; W. Krawietz, 1978, par 26; criticism of free law movements H. Reichel, 1915, p. 44ff; F. Somlo, 1917, pp. 392ff, 415ff, 422ff.
3. Montesquieu, 1969, book XI, Ch 6
4. cf., J. Wróblewski, 1956, Ch III.2, 3.
5. C. Bahr, 1984; D. Bruggemann, 1962, Ch I; R. Baumlin, 1954, part II, par 1, 2; F. A. Hayek, 1960; Ch 13; E. Fechner, 1977; H. Naviasky, 1956, vol. III, par 12; J. Raether, 1967.