August Schleicher: Perbedaan antara revisi

* [http://www.utexas.edu/cola/depts/lrc/iedocctr/ie-docs/lehmann/reader/Chapter8.html August Schleicher] (Universitas Texas)

* [http://www.courses.fas.harvard.edu/~hsci278/Readings_on_Language/Darwin_and_language_by_Richards.htm The Linguistic Creation of Man: Charles Darwin, August Schleicher, Ernst Haeckel, and the Missing Link in Nineteenth-Century Evolutionary Theory] (oleh Robert J. Richards)

* [http://www.grsampson.net/Q_PIE.html Say something in Proto-Indo-European] (oleh [[Geoffrey Sampson]])

* [http://www.lankalibrary.com/books/sinhala3.htm Sinhala, 6000 years ago] (oleh Asiff Hussein)