Tohutoro APA (7th ed.)
Obertson, A. (1802). geometrical Treatise of conic sections.
Tohutoru Kātū Chicago (17th ed.)
Obertson, Abraham. Geometrical Treatise of Conic Sections. Oxford, 1802.
Tohutoro MLA (9th ed.)
Obertson, Abraham. Geometrical Treatise of Conic Sections. 1802.
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