Παραπομπή APA

Toulmin, S., & Goodfield, J. (1961). The fabric of the heavens. Penguin.

Παραπομπή Chicago Style

Toulmin, Stephen, και June Goodfield. The Fabric of the Heavens. England: Penguin, 1961.

Παραπομπή MLA

Toulmin, Stephen, και June Goodfield. The Fabric of the Heavens. Penguin, 1961.