National Research Council (US) Committee on a Conceptual Framework for New K-12 Science Education Standards. (2012). A framework for K-12 Science education: Practices, cross-cutting concepts and core ideas. The National Academies Press.
Lua i Stíl Chicago (17ú heag.)National Research Council (US) Committee on a Conceptual Framework for New K-12 Science Education Standards. A Framework for K-12 Science Education: Practices, Cross-cutting Concepts and Core Ideas. Washington D.C: The National Academies Press, 2012.
Lua MLA (9ú heag.)National Research Council (US) Committee on a Conceptual Framework for New K-12 Science Education Standards. A Framework for K-12 Science Education: Practices, Cross-cutting Concepts and Core Ideas. The National Academies Press, 2012.