Pratt, H., & Bybee, R. W. (2012). The NSTA reader's guide to a framework for K-12 science education: Practices, crosscutting concepts, and core ideas (Expanded edition.). NSTA Press.

Pratt, Harold, and Rodger W. Bybee. The NSTA Reader's Guide to a Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas. Expanded edition. Arlington, Virginia: NSTA Press, 2012.

Pratt, Harold, and Rodger W. Bybee. The NSTA Reader's Guide to a Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas. Expanded edition. NSTA Press, 2012.