Datta, Ankur
Oxford University Press, 2016
eBooks
Delhi : Publications Dividision
Majalah, Jurnal, Buletin
Karim, Nik Safiah
Dewan Bahasa dan Pustaka, Kementrian Pendidikan Malaysia, 1989
Buku Teks SO
Timings, Roger Leslie, 1927-
Longman, 2000
Buku Teks SO
Kluwer Academic Publishers, 1995,
Buku Referensi