Melzack, R. (1973). Puzzle of pain. Penguin Books.
Chicago Style aipamenaMelzack, Ronald. Puzzle of Pain. Armondworth: Penguin Books, 1973.
MLA aipamenaMelzack, Ronald. Puzzle of Pain. Penguin Books, 1973.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.