Cita APA (7th ed.)

Hartle, J. B. (2014). Gravity: An introduction to Einstein's general relativity. Pearson.

Cita Chicago (17th ed.)

Hartle, James B. Gravity: An Introduction to Einstein's General Relativity. Nodia: Pearson, 2014.

Cita MLA (9th ed.)

Hartle, James B. Gravity: An Introduction to Einstein's General Relativity. Pearson, 2014.