Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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