Oxford Dictionary of Word Origins
Julia Cresswell
Father Seraphim Rose: His Life and Works
Hieromonk Damascene
The Cathars: The Most Successful Heresy of the Middle Ages
Sean Martin
The Philosophy of Design
Glenn Parsons
Wikipedia: The Missing Manual
John Broughton
Missing Manual (1)
Watchmen and Philosophy: A Rorschach Test
William Irwin & Mark D. White