APA (7th ed.) Zitazioa
NAGEL, L., & ET AL. STUDENTS' SELF-REPORTED SUBSTANCE USE BY GRADE LEVEL AND GENDER.
Chicago Style (17th ed.) Zitazioa
NAGEL, L., eta ET AL. STUDENTS' SELF-REPORTED SUBSTANCE USE BY GRADE LEVEL AND GENDER.
MLA (9th ed.) Zitazioa
NAGEL, L., eta ET AL. STUDENTS' SELF-REPORTED SUBSTANCE USE BY GRADE LEVEL AND GENDER.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.