Simpson, T.M. 1970. Benson Mates, “Leibniz on Possible Worlds”, Logic, Methodology and Philosophy of Science III. Crítica. Revista Hispanoamericana de Filosofía. 4, 10 (Jan. 1970), 123–127. DOI:https://doi.org/10.22201/iifs.18704905e.1970.82.