Logic (Introductory monographs in mathematics)
An Introduction to the Logic of the Sciences
Systems of Formal Logic
The Core of Mathematics An Introduction to Modern Mathematics
Deontic Logic: Introductory and Systematic Readings
Problems of the Logic of Scientific Knowledge (Synthese Library, 25)
Model Theory for Modal Logic Kripke Models for Modal Predicate Calculi
An Introduction to the Philosophy of Bernard Lonergan
Reason and reality (Royal Institute of Philosophy lectures)
Topics in Philosophical Logic (Synthese Library, 17)