Hester Jeff, Blumenthal George, & Burstein David. (2002). 21st Century Astronomy (In lần thứ 1.). England: Norton.
शिकागो स्टाइल उद्धरणHester Jeff, Blumenthal George, और Burstein David. 21st Century Astronomy. In lần thứ 1. England: Norton, 2002.
एमएलए उद्धरणHester Jeff, Blumenthal George, और Burstein David. 21st Century Astronomy. In lần thứ 1. England: Norton, 2002.
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