A must read for Presbyterians on PB: John R Muether's book: Cornelius Van Til, Reformed Apologist and Churchman. The book sets Mr. Van Till's apologetics into the context of his church life and times which aids greatly in understanding his work. The biography also helped me fit together why certain people and institutions are aligned as they are today. Perhaps most important is his message to seek a consistently reformed perspective:
"Do Reformed Christians want their own witness, the only consistent witness to the Christian faith, to be heard in the world? Then let them band together with all Reformed men everywhere for a common testimony to that which can really challenge the wisdom of the world."