APA (7th ed.) Zitazioa

Percentile Distribution of Writing Performance Scores: 1984-96. US Department of Education.

Chicago Style (17th ed.) Zitazioa

Percentile Distribution of Writing Performance Scores: 1984-96. US Department of Education.

MLA (9th ed.) Zitazioa

Percentile Distribution of Writing Performance Scores: 1984-96. US Department of Education.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.