“Cepheids.” How Old Is the Universe?, by DAVID A. WEINTRAUB, Princeton University Press, PRINCETON; OXFORD, 2011, pp. 175–190, www.jstor.org/stable/j.ctt7sx5g.17. Accessed 10 Aug. 2020.
WEINTRAUB, D. (2011). Cepheids. In How Old Is the Universe? (pp. 175-190). PRINCETON; OXFORD: Princeton University Press. Retrieved August 10, 2020, from www.jstor.org/stable/j.ctt7sx5g.17
WEINTRAUB, DAVID A. "Cepheids." In How Old Is the Universe?, 175-90. PRINCETON; OXFORD: Princeton University Press, 2011. Accessed August 10, 2020. www.jstor.org/stable/j.ctt7sx5g.17.
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