Ugo Adriano Graziotti, PLATE 3: Solid Tetrakis Hexahedron, Polyhedra: The Realm of Geometric Beauty, U. A. G., University of San Francisco, 1962 [2019-09-05], (原始内容存档于2021-08-23)
Ugo Adriano Graziotti, PLATE 3: Solid Tetrakis Hexahedron, Polyhedra: The Realm of Geometric Beauty, U. A. G., University of San Francisco, 1962 [2019-09-05], (原始内容存档于2021-08-23)