Analysis of information sources in references of the Wikipedia article "Concentric objects" in English language version.
Spheres: Apostol (2013)
Regular polygons: Hardy, Godfrey Harold (1908), A Course of Pure Mathematics, The University Press, p. 107
Regular polyhedra: Gillard, Robert D. (1987), Comprehensive Coordination Chemistry: Theory & background, Pergamon Press, pp. 137, 139, ISBN 9780080262321.
Spheres: Apostol (2013)
Regular polygons: Hardy, Godfrey Harold (1908), A Course of Pure Mathematics, The University Press, p. 107
Regular polyhedra: Gillard, Robert D. (1987), Comprehensive Coordination Chemistry: Theory & background, Pergamon Press, pp. 137, 139, ISBN 9780080262321.