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“Distances and Light.” How Old Is the Universe?, by DAVID A. WEINTRAUB, Princeton University Press, PRINCETON; OXFORD, 2011, pp. 55–60, Accessed 12 Aug. 2020.
WEINTRAUB, D. (2011). Distances and Light. In How Old Is the Universe? (pp. 55-60). PRINCETON; OXFORD: Princeton University Press. Retrieved August 12, 2020, from
WEINTRAUB, DAVID A. "Distances and Light." In How Old Is the Universe?, 55-60. PRINCETON; OXFORD: Princeton University Press, 2011. Accessed August 12, 2020.

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