Dyfyniad APA

Ball, R. S. (1887). The story of heavens (3ª ed.). Casell and Company.

Dyfyniad Arddull Chicago

Ball, Robert Stawell. The Story of Heavens. 3ª ed. Casell and Company, 1887.

Dyfyniad MLA

Ball, Robert Stawell. The Story of Heavens. 3ª ed. Casell and Company, 1887.

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