Labuda, P., 2014. Ins?trumenta?lny realizmus, ontolo?gia rozli?s?eni? a proble?m ontologicke?ho statusu ins?trumentov. Organon F, 21, s.180-197. Available at: http://www.klemens.sav.sk/fiusav/doc/organon/2014/2/180-197.pdf.