APA aipamena

Sagan, H. (1969). Introduction to the calculus of variations. McGraw-Hill.

Chicago Style aipamena

Sagan, Hans. Introduction to the Calculus of Variations. McGraw-Hill, 1969.

MLA aipamena

Sagan, Hans. Introduction to the Calculus of Variations. McGraw-Hill, 1969.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.