Bovair, Keith
Modern languages for all
Kogan Page, 1992
 Buku Teks SO
Teaching modern languages
edited by Ann Swarbrick
Routledge, 1994
 Buku Teks SO
Schapper, Antoinette
Neuter gender in the languages of aru
Faculty of Humanities University of Indonesia, 2015
 Artikel Jurnal
Sellato, Bernard
The languages and peoples of the müller mountains a contribution to the study of the origins of borneo's nomads and their languages
Faculty of Humanities University of Indonesia, 2015
 Artikel Jurnal
The Uralic languages
edited by Daniel Abondolo
Routledge, 1998
 Buku Teks SO