Newcastle, M. C. (1664). Philosophical letters, or, Modest reflections upon some opinions in natural philosophy: Maintained by several famous and learned authors of this age, expressed by way of letters. [s.n.].
Chicago Style (17th ed.) CitationNewcastle, Margaret Cavendish. Philosophical Letters, or, Modest Reflections upon Some Opinions in Natural Philosophy: Maintained by Several Famous and Learned Authors of This Age, Expressed by Way of Letters. London: [s.n.], 1664.
MLA (9th ed.) CitationNewcastle, Margaret Cavendish. Philosophical Letters, or, Modest Reflections upon Some Opinions in Natural Philosophy: Maintained by Several Famous and Learned Authors of This Age, Expressed by Way of Letters. [s.n.], 1664.
Warning: These citations may not always be 100% accurate.