O. Madelung; U. Rössler; M. Schulz, eds. (1998). "Cuprous oxide (Cu2O) band structure, band energies". Landolt-Börnstein – Group III Condensed Matter. Numerical Data and Functional Relationships in Science and Technology. Vol. 41C: Non-Tetrahedrally Bonded Elements and Binary Compounds I. pp. 1–4. doi:10.1007/10681727_62. ISBN978-3-540-64583-2.