Askwith, E. H. (1961). Analytical geometry of the conic sections (23.).
Chicago Edition CitationAskwith, E H. Analytical Geometry of the Conic Sections. 23. Adam & Charles Black, London, 1961.
MLA Edition CitationAskwith, E H. Analytical Geometry of the Conic Sections. 23. 1961.
Warning: These citations may not always be 100% accurate.