APA aipamena

Campbell, A. (2003). The virtues (and vices) of the four principles. BMJ Group.

Chicago Style aipamena

Campbell, A. The Virtues (and Vices) of the Four Principles. BMJ Group, 2003.

MLA aipamena

Campbell, A. The Virtues (and Vices) of the Four Principles. BMJ Group, 2003.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.