Παραπομπή APA

Brown, S. B. (1972). Realm of science ( 21 Vols.): :vol.13 nature of the universe: modern cosmology. Touchstone.

Παραπομπή Chicago Style

Brown, Stanley. B. Realm of Science ( 21 Vols.): :vol.13 Nature of the Universe: Modern Cosmology. USA: Touchstone, 1972.

Παραπομπή MLA

Brown, Stanley. B. Realm of Science ( 21 Vols.): :vol.13 Nature of the Universe: Modern Cosmology. Touchstone, 1972.