1. Ayyub, B.M. 2001. Elicitation of expert opinions for uncertainty and risks. Boca Raton: CRC Press.
2. Bell, W. 2003. Foundations of futures studies. History, purposes, and knowledge. Human science for a new era, vol. 1. Piscataway: Transaction Publishers (5th rep., 2009; 1st ed., 1997).
3. Douglas, H.E. 2009. Reintroducing prediction to explanation. Philosophy of Science 76 (4): 444–463.
4. Eagle, A. 2005. Randomness is unpredictability. British Journal for the Philosophy of Science 56: 749–790.
5. Fernández Valbuena, S. 1990. Predicción y Economía. In Aspectos metodológicos de la investigación científica, ed. W.J. Gonzalez, 2nd ed., 385–405. Madrid-Murcia: Ediciones Universidad Autónoma de Madrid and Publicaciones Universidad de Murcia.