APA aipamena

(2000). Science: Overview, 1999. U.S. Department of Education.

Chicago Style aipamena

Science: Overview, 1999. U.S. Department of Education, 2000.

MLA aipamena

Science: Overview, 1999. U.S. Department of Education, 2000.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.