Von Krämer, W. Fortschrittsfalle Medizin (Medical progress traps), Der Spiegel, 13 March 1989
stanford.edu
plato.stanford.edu
Meek Lange, Margaret (2011), «Progress», in: Zalta, Edward N., The Stanford Encyclopedia of Philosophy Spring 2011 ed. , Metaphysics Research Lab, Stanford University, consultado em 1 de novembro de 2018