MLA

Newcastle, Margaret Cavendish, Duchess of, 1624?-1674. Observations upon experimental philosophy. To which is added The description of a new blazing world. 1666.. https://collections.library.yale.edu/catalog/2047207.

APA, 6th edition

Newcastle, Margaret Cavendish, Duchess of, 1624?-1674. (1666.)[Observations upon experimental philosophy. To which is added The description of a new blazing world]. https://collections.library.yale.edu/catalog/2047207.