Hjalti Hugason, gen. ed., Kristni á Íslandi . 4 vols. Reykjavík: Alþingi, 2000. 1: pp. xiv, 434; black-and-white and color figures, color maps, and tables. 2: pp. 373; black-and white and color figures and color maps. 3: pp. 418; black-and-white and color figures, color maps, and tables. 4: pp. 466; black-and-white and color figures and tables.