Παραπομπή APA

Frankel, T. (1979). Gravitational curvature: An introduction to Einstein's theory. W.H. Freeman and Company.

Παραπομπή Chicago Style

Frankel, Theodore. Gravitational Curvature: An Introduction to Einstein's Theory. San francisco: W.H. Freeman and Company, 1979.

Παραπομπή MLA

Frankel, Theodore. Gravitational Curvature: An Introduction to Einstein's Theory. W.H. Freeman and Company, 1979.