1. Brogaard, B., & Salerno, J. (2004). Fitch’s paradox of knowability. In E. N. Zalta (Ed.), The stanford encyclopedia of philosophy. http://plato.stanford.edu/archives/sum2004/entries/fitch-paradox/ .
2. Brogaard B., Salerno J. (2006) Knowability and a modal closure principle. American Philosophical Quarterly, 43: 261–270
3. Burgess J. (2009) Can truth out?. In: Salerno J. (eds) New essays on knowability. Oxford University Press, Oxford
4. DeVidi D., Kenyon T. (2003) Analogues of knowability. Australasian Journal of Philosophy 81: 481–495
5. Edgington D. (1985) The paradox of knowability. Mind 93: 557–568