APA aipamena

(2001). Brazil: Tough nut cracked. BMJ Group.

Chicago Style aipamena

Brazil: Tough Nut Cracked. BMJ Group, 2001.

MLA aipamena

Brazil: Tough Nut Cracked. BMJ Group, 2001.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.