Sitter, W. d. (1932). Kosmos: A course of six lectures on the development of our insight into the structure of the universe, delivered for the Lowell institute in Boston, in November 1931. Harvard university press.
Chicago Style (17th ed.) CitationSitter, Willem de. Kosmos: A Course of Six Lectures on the Development of Our Insight into the Structure of the Universe, Delivered for the Lowell Institute in Boston, in November 1931. Cambridge, Mass.: Harvard university press, 1932.
MLA (9th ed.) CitationSitter, Willem de. Kosmos: A Course of Six Lectures on the Development of Our Insight into the Structure of the Universe, Delivered for the Lowell Institute in Boston, in November 1931. Harvard university press, 1932.
Warning: These citations may not always be 100% accurate.