Mathematics Performance of 4th-, 8th-, & 12th- Grade Students. US Department of Education.
Chicago-referens (17:e uppl.)Mathematics Performance of 4th-, 8th-, & 12th- Grade Students. US Department of Education.
MLA-referens (9:e uppl.)Mathematics Performance of 4th-, 8th-, & 12th- Grade Students. US Department of Education.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.