Cowan, R. D. (1981). The theory of atomic structure and spectra. University of California Press.
शिकागो स्टाइल उद्धरणCowan, Robert Duane. The Theory of Atomic Structure and Spectra. Berkeley: University of California Press, 1981.
एमएलए उद्धरणCowan, Robert Duane. The Theory of Atomic Structure and Spectra. University of California Press, 1981.
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