Pila, J. (2010). On the European Requirement for an Invention.
Chicago-čujuhus (17. p.)Pila, J. On the European Requirement for an Invention. 2010.
MLA-čujuhus (9. p.)Pila, J. On the European Requirement for an Invention. 2010.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.