SINGH, R. विश्व की भाषाओ का वर्गीकरण: १. Vidyapith (વિદ્યાપીઠ), [S. l.], v. 32, n. 3, p. 45–63, 1994. Disponível em: http://journal.gujaratvidyapith.org/index.php/vp/article/view/665. Acesso em: 7 dec. 2025.