Literatura
1. Tolkien, Humphrey Carpenter and Christopher. The Letters of J.R.R. Tolkien. George
Allen & Unwin, 1981.
2. Association, International Auxiliary Language. Outline of Program. IALA, 1924.
3. Jaspersen, Otto. Historio di Nia Linguo: History of Our Language. London: J.W. Baxter,
1921.
4. Sprague, Charles E. Handbook of Volapuk. New York: The Office Company, 1888.
5. Harlow, Don. How to Build a Language. New York, 4 June 2006.
6. Okrent, Arika. In the Land of Invented Languages. Spiegel & Grau, 2009.
7. Trudgil, Peter. Sociolinguistics: An Introduction. New York: Pelican, 1974.
8. Editors, Multiple. Encyclopaedia Britannica. London: Encyclopædia Britannica, Inc.,
2003.
Electronic Sources
9. Wikipedia. Wikipedia The Free Encyclopedia. 12 July 2011. 7 September 2011
<http://en.wikipedia.org/wiki/Languages_constructed_by_J._R._R._Tolkien>.
10. Wikipedia. Wikipedia - The Free Encyclopedia. 9 July 2011. 7 September 2011
<http://en.wikipedia.org/wiki/Ido>.
11. Wikipedia. Wikipedia, The Free Encyclopedia. 30 August 2011. 6 September 2011
<http://en.wikipedia.org/wiki/Interlingua>.
12. Ager, Simon. Omniglot, Writing Systems and Languages of the World. 1998. 1
September 2011.
<http://www.omniglot.com/writing/volapuk.htm>