Freda Hussain.
Routledge, 2014
Buku Teks
Erades, Judge
Martinus Nijhoff Publishers, 1983
Buku Teks
Muhammad Iqbal
Universitas Indonesia, 2012
UI - Skripsi Membership
Scollon, Ronald
Routledge , 2001
Buku Teks
Ajwani-Ramchandani, Raji
Emerald, 2017
eBooks