↑ Spudis, P. D. (November 10–12, 1980). Merrill, R.B.; Schultz, P. H. (biên tập). “Petrology of the Apennine Front, Apollo 15: Implications for the Geology of the Imbrium Impact Basin”. Abstracts of Papers Presented to the Conference on Multi-ring Basins: Formation and Evolution. Lunar and Planetary Institute. Bibcode:1980LPICo.414...83S.
