APA استشهاد

Brown, S. B. (1972). Realm of science (21 Vols.): : vol.15 the earth and its origin. Touchstone.

استشهاد بنمط شيكاغو

Brown, Stanley. B. Realm of Science (21 Vols.): : Vol.15 the Earth and Its Origin. USA: Touchstone, 1972.

MLA استشهاد

Brown, Stanley. B. Realm of Science (21 Vols.): : Vol.15 the Earth and Its Origin. Touchstone, 1972.