Bryn Mawr : Intercellegiate Studies Institute
Majalah, Jurnal, Buletin
Gao, Yande
Beijing Yuyan Xueyun, 1993
Buku Teks
Jakarta : Universitas Nasional
Majalah, Jurnal, Buletin
Australia : The Australian Institute Politica Sciencel, {s.a}
Majalah, Jurnal, Buletin
Columbia : Columbia University Press and American Dialect Society
Majalah, Jurnal, Buletin