Santayana, George, author
Charles Scribner's Sons, 1945
Buku Teks
Held, Colbert C., author
Westview Press, 1989
Buku Teks
Held, Colbert C.
Westview Press, 2014
Buku Teks
Hoyt, Robert S., author
Harcourt, Brace & World, 1966
Buku Teks
Maria Fransisca Elita Thea, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2020
UI - Tugas Akhir