Helga Kuhse & Peter Singer. (2012). A companion to bioethics (2.). Wiley Blackwell.
Chicago Style aipamenaHelga Kuhse and Peter Singer. A Companion to Bioethics. 2. West Sussex: Wiley Blackwell, 2012.
MLA aipamenaHelga Kuhse and Peter Singer. A Companion to Bioethics. 2. Wiley Blackwell, 2012.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.