Clarke, Stephen
Black Swan, 2015
Buku Teks SO
Alvin Adityo
Universitas Indonesia, 2019
UI - Tugas Akhir
Funk, Arthur Layton
Norman University of Oklahoma Press, 1959
Buku Teks SO
Schuman, Frederick L.
Whittlesey House, 1931
Buku Teks SO
Shklar, Judith N.
Pustaka Utama Grafiti, 1996
Buku Teks