Παραπομπή APA

Toulmin, S., & Goodfield, J. (1961). Fabric of the heavens.

Παραπομπή Chicago Style

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

Παραπομπή MLA

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