MacNair, Harley Fransworth
Commercial Press, 1926
Buku Teks
Nicholson, Michael, author
Cambridge University Press, 1989
Buku Teks
Douherty, James E., author
J.B. Lippincott, 1971
Buku Teks
Wu, Aitchen K.
Methuen , 1950
Buku Teks
Akia Kevin Muliansyah Athallah, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2021
UI - Tugas Akhir