Vincent van Gogh, Anthon Gerhard Alexander Rappard (ridder van), Anthon van Rappard (1936). “Letters to an artist: from Vincent van Gogh to Anton ridder van Rappard, 1881-1885”
Theodore Roosevelt (2015). “Theodore Roosevelt on Bravery: Lessons from the Most Courageous Leader of the Twentieth Century”, p.7, Skyhorse Publishing, Inc.