Cita APA (7th ed.)

Hartle, J. B. (2003). Gravity: An introduction to Einstein's general relativity. Pearson Education.

Cita Chicago (17th ed.)

Hartle, James B. Gravity: An Introduction to Einstein's General Relativity. San Francisco: Pearson Education, 2003.

Cita MLA (9th ed.)

Hartle, James B. Gravity: An Introduction to Einstein's General Relativity. Pearson Education, 2003.