Collins, James T., author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2021
Artikel Jurnal
Schiffman, Harold F., author
Routledge, 1996
Buku Teks
Chaudenson, Robert, author
Routledge, 2001
Buku Teks SO
edited by Sohn Ho-min
University of Hawaii, 2006
Buku Teks
edited by Alessandro Duranti
Blaxkwell , 2004
Buku Teks