Dyfyniad APA

Freud, S. (1991). On metapsychology: The theory of psychoanalysis : 'Beyond the pleasure principle, ' 'The ego and the id' and other works. Penguin.

Dyfyniad Arddull Chicago

Freud, Sigmund. On Metapsychology: The Theory of Psychoanalysis : 'Beyond the Pleasure Principle, ' 'The Ego and the Id' and Other Works. London: Penguin, 1991.

Dyfyniad MLA

Freud, Sigmund. On Metapsychology: The Theory of Psychoanalysis : 'Beyond the Pleasure Principle, ' 'The Ego and the Id' and Other Works. Penguin, 1991.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.