Philosophiae naturalis principia mathematica.

MLA

Newton, Isaac, et al. Philosophiae naturalis principia mathematica. Third edition (1726), with variant readings, assembled and edited by Alexandre Koyré and I. Bernard Cohen, with the assistance of Anne Whitman. [Cambridge, Mass.] : Harvard University Press, 1972.

APA

Newton, I., Koyré, A., Cohen, I. & Edgar Fahs Smith Memorial Collection (University of Pennsylvania). (1972). Philosophiae naturalis principia mathematica. Third edition (1726), with variant readings, assembled and edited by Alexandre Koyré and I. Bernard Cohen, with the assistance of Anne Whitman. [Cambridge, Mass.] : Harvard University Press.

Chicago

Newton, Isaac, Alexandre Koyré, I. Bernard Cohen and Edgar Fahs Smith Memorial Collection (University of Pennsylvania). Philosophiae naturalis principia mathematica. Edited by Alexandre Koyré and I. Bernard Cohen. Third edition (1726), with variant readings, assembled and edited by Alexandre Koyré and I. Bernard Cohen, with the assistance of Anne Whitman. [Cambridge, Mass.] : Harvard University Press, 1972.