Frankel, T. (1979). Gravitational curvature: An introduction to Einstein's theory. W.H. Freeman and Company.
Čikaški stil citiranjaFrankel, Theodore. Gravitational Curvature: An Introduction to Einstein's Theory. San francisco: W.H. Freeman and Company, 1979.
MLA način citiranjaFrankel, Theodore. Gravitational Curvature: An Introduction to Einstein's Theory. W.H. Freeman and Company, 1979.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.