Παραπομπή APA

Cohen, I. B. (1971). Introduction to Newton's "Principia". University Press.

Παραπομπή Chicago Style

Cohen, I. Bernard. Introduction to Newton's "Principia". Cambridge [Eng.]: University Press, 1971.

Παραπομπή MLA

Cohen, I. Bernard. Introduction to Newton's "Principia". University Press, 1971.