File:Empirical Cycle.pngDescriptionEmpirical Cycle.png English: A visual representation of A.D. de Groot's empirical cycle. Date 30 October 2008 Source Own work Author TesseUndDaan
File:Empirical Cycle.svgtruetrue This image is a derivative work of the following images: File:Empirical_Cycle.png licensed with Cc-by-3.0 2008-10-30T14:12:08Z TesseUndDaan 810x742
File:Empirical Cycle-it.svgDescriptionEmpirical Cycle-it.svg Italiano: Ricerca empirica Date 31 August 2013, 11:43:18 Source Empirical_Cycle.png Empirical_Cycle.svg Author Empirical_Cycle
File:Empirical Cycle-es.svgDescriptionEmpirical Cycle-es.svg Español: Representación visual de un círculo empírico. Date 30 August 2013, 12:03:42 Source Empirical_Cycle.png Empirical_Cycle