APA (7th ed.) Citation

Valens, E. G. (1969). The attractive universe: Gravity and the shape of space. World Pub. Co..

Chicago Style (17th ed.) Citation

Valens, Evans G. The Attractive Universe: Gravity and the Shape of Space. Cleveland: World Pub. Co., 1969.

MLA (9th ed.) Citation

Valens, Evans G. The Attractive Universe: Gravity and the Shape of Space. World Pub. Co., 1969.