A. B. Hoen, Discussion of the Requisite Qualities of Lithographic Limestone, with Report on Tests of the Lithographic Stone of Mitchell County, Iowa, Iowa Geological Survey Annual Report, 1902, Des Moines, 1903; pages 339–352.
Brooks, Frederick Vincent (1911). "Lithography" . Dalam Chisholm, Hugh (penyunting). Encyclopædia Britannica (dalam bahasa Inggeris). 16 (ed. ke-11). Cambridge University Press. m/s. 785–789.