Coherence, Certainty, and Epistemic Priority
An article by Roderick Firth published in "The Journal of Philosophy," Vol. LXVI, No. 19 (October, 1964).
Sellars-Firth Correspondence (1974)
Correspondence between Wilfrid Sellars and Roderick Firth.
Sense Data and the Percept Theory
Roderick Firth's article published in "Mind," 58 (1949); 59 (1950).