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Vincent van Gogh, Vincent Willem Gogh (1927). “The Letters of Vincent Van Gogh to His Brother, 1872-1886: With a Memoir by His Sister-in-law, J. Van Gogh-Bonger ...”
Naomi E. Maurer, Vincent van Gogh, Paul Gauguin (1998). “The Pursuit of Spiritual Wisdom: The Thought and Art of Vincent Van Gogh and Paul Gauguin”, p.9, Fairleigh Dickinson Univ Press