Sitter, W. d., & Schaar, J. P. v. d. (1934). Kosmos. Amsterdam Academic Archive.
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Dyfyniad Arddull Chicago
Sitter, William de, and Jan Pieter van der Schaar. Kosmos. [Amsterdam]: Amsterdam Academic Archive, 1934.
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Dyfyniad MLA
Sitter, William de, and Jan Pieter van der Schaar. Kosmos. Amsterdam Academic Archive, 1934.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.