Proctor, R. A. (1899). Other worlds than ours: The plurality of worlds studied under the light of scientific researches. Longmans, Green.
Chicago-Zitierstil (17. Ausg.)Proctor, Richard A. Other Worlds than Ours: The Plurality of Worlds Studied Under the Light of Scientific Researches. London: Longmans, Green, 1899.
MLA-Zitierstil (8. Ausg.)Proctor, Richard A. Other Worlds than Ours: The Plurality of Worlds Studied Under the Light of Scientific Researches. Longmans, Green, 1899.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.