Hanoi : Democratic Republic of Vietnam
Majalah, Jurnal, Buletin
Erlangga Ibrahim, author
Gramedia Pustaka Utama, 2016
Buku Teks
Ryfky Eka Putra, author
2010
UI - Skripsi (Open)
Poale, Peter A.
Ohio University, 1970
Buku Teks
Brand, Mona, author
Foreign Languages Publishing House, 1958.
Buku Teks