Παραπομπή APA

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

Παραπομπή Chicago Style

Hartle, J. B. Gravity: An Introduction to Einstein's General Relativity. Delhi: Pearson education, 2003.

Παραπομπή MLA

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