1. Birkhoff, G. (1923). Relativity and Modern Physics, Harvard University Press.
2. Weinberg, S. (1972). Gravitation and Cosmology: Principles and Applications of the General Theory of Relativity, Wiley.
3. Does Birkhoff’s theorem really hold?;Lin;Cogent. Phys.,2017
4. Singular hypersurfaces and thin shells in general relativity;Israel;Nuovo C. B,1966
5. Lightman, A., Press, W., Price, R., and Teukolsky, S. (1975). Problem Book in Relativity and Gravitation, Princeton Univiversity Press.