Dobzhansky, Theodosius
The biological basis of human freedom
Columbia University Press, 1956
 Buku Teks
Bookchin, Murray
The ecology of freedom: emergence and dissolution of hierarchy
Black Rose Books, 1991
 Buku Teks
Heimann, Eduard
Freedom and order : lessons from the war / Eduard Heimann
Charles Scribner`s Sons, 1947
 Buku Teks SO
Hurst, James Willard
Law and the conditions of freedom in the Nineteenth-Century United States / James Willard Hurst
University of Wisconsin Press, 1956
 Buku Teks SO
Holcombe, Arthur N.
Human Rights in the modern world / by Arthur N. Holcombe
New York University press, 1948
 Buku Teks SO