Percentile Distribution of Writing Performance Scores: 1984-96. US Department of Education.
Chicago-referens (17:e uppl.)Percentile Distribution of Writing Performance Scores: 1984-96. US Department of Education.
MLA-referens (9:e uppl.)Percentile Distribution of Writing Performance Scores: 1984-96. US Department of Education.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.