Fraknoi, A., & Morrison, D. W. (2001). Voyages through the universe (2nd ed.). Harcourt College Publishers.
Chicago-стиль цитированияFraknoi, Andrew, and David Wolff Morrison. Voyages Through the Universe. 2nd ed. Philadelphia: Harcourt College Publishers, 2001.
MLA-цитированиеFraknoi, Andrew, and David Wolff Morrison. Voyages Through the Universe. 2nd ed. Harcourt College Publishers, 2001.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.