Rewald Sabine. Caspar David Friedrich: Moonwatchers

New York: Metropolitan Museum of Art. 2001. — 58 p. — ISBN: 1-58839-004-7This book celebrated the recent acquisition by the Metropolitan Museum of its first painting by the German Romantic Caspar David Friedrich (1774-1840). "Two Men Contemplating the Moon" (ca.1830), purchased with funds provided by Mrs. Jayne Wrightsman is one of three variations that Friedrich made on one of his most recognizable and characteristic motifs.