Bray, R.G.A. de
Guide to the Slavonic languages
J.M. Dent & Sons, 1951
 Buku Teks SO
Ivancev, Svetomir
Пропблеми на аспектуалността в славянските езици = Probelmi na aspektualnostta v slavjankite ezitsi
Izdatelstvo na b`lgarskata akademija na naukite, 1971
 Buku Referensi
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