Citazione Stile APA (7a Edizione)

Clotfelter, B. E. (1976). The universe and its structure. McGraw-Hill.

Citazione stile Chigago Style (17a edizione)

Clotfelter, Beryl E.. The Universe and Its Structure. New York: McGraw-Hill, 1976.

Citatione MLA (9a ed.)

Clotfelter, Beryl E.. The Universe and Its Structure. McGraw-Hill, 1976.