edited by Frank S. Barnes and Ben Greenebaum
CRC Press, Taylor & Francis, 2007
Buku Referensi
edited by R. Charudattan and H.L. Walker
John Wiley & Sons, 1982
Buku Teks
Nayaka Cyantika, author
2015
UI - Tugas Akhir
Widdowson, Peter, author
Routledge, 1999
Buku Teks
Yearimdang, author
PT Elex Media Komputindo, 2017
Buku Teks