Sen, Amartya, 1933-
Development as freedom
Knopf, 1999
 Buku Teks SO
Morrison, John
This freedom
Penguin Books, 1985
 Buku Teks SO
Bagas Pratomo
Pengembangan dan Pengujian Robot Arm Skala Kecil denga 2 Degree of Freedom = Small scale Arm robot Development and Testing with 2 Degree of Freedom
Fakultas Teknik Universitas Indonesia, 2022
 UI - Skripsi Membership
Fromm, Erich
Fear of freedom
Routledge Classics, 2001
 Buku Teks SO
Info Freedom
Jakarta : Freedom Institute, 2006,
 Majalah, Jurnal, Buletin