एपीए उद्धरण

Fre, P. G. Gravity, a geometrical course: 2v.; v1-development of the theory and basic physical applications; v2-Black holes ,cosmology and introduction to supergravity.

शिकागो स्टाइल उद्धरण

Fre, Pietro Giuseppe. Gravity, a Geometrical Course: 2v.; V1-development of the Theory and Basic Physical Applications; V2-Black Holes ,cosmology and Introduction to Supergravity.

एमएलए उद्धरण

Fre, Pietro Giuseppe. Gravity, a Geometrical Course: 2v.; V1-development of the Theory and Basic Physical Applications; V2-Black Holes ,cosmology and Introduction to Supergravity.