Singh, R. (1994) “विश्व की भाषाओ का वर्गीकरण: १”, Vidyapith (વિદ્યાપીઠ), 32(3), pp. 45–63. Available at: http://journal.gujaratvidyapith.org/index.php/vp/article/view/665 (Accessed: 15 October 2025).