(2007). Nation's Report Card: Mathematics 2003 & 2005 Performance in Puerto Rico - Highlights. U.S. Department of Education.
Dyfyniad Arddull ChicagoNation's Report Card: Mathematics 2003 & 2005 Performance in Puerto Rico - Highlights. U.S. Department of Education, 2007.
Dyfyniad MLANation's Report Card: Mathematics 2003 & 2005 Performance in Puerto Rico - Highlights. U.S. Department of Education, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.