APA (7th ed.) Zitazioa
PICKERING, H., & ET AL. (1993). CRACK INJECTION. MORE CRACK USERS ARE INJECTING, RISKING SERIOUS HEALTH PROBLEMS.
Chicago Style (17th ed.) Zitazioa
PICKERING, H., eta ET AL. CRACK INJECTION. MORE CRACK USERS ARE INJECTING, RISKING SERIOUS HEALTH PROBLEMS. 1993.
MLA (9th ed.) Zitazioa
PICKERING, H., eta ET AL. CRACK INJECTION. MORE CRACK USERS ARE INJECTING, RISKING SERIOUS HEALTH PROBLEMS. 1993.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.