APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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