Cita APA (7a ed.)

Nehmer, K. S., & Belongie, M. (2011). Educators guide to free science materials: (for use during school year 2011-2012) (52nd annual ed.). Educators Progress Service.

Cita Chicago Style (17a ed.)

Nehmer, Kathleen Suttles, y Michael Belongie. Educators Guide to Free Science Materials: (for Use During School Year 2011-2012). 52nd annual ed. Randolph, Wisconsin: Educators Progress Service, 2011.

Cita MLA (9a ed.)

Nehmer, Kathleen Suttles, y Michael Belongie. Educators Guide to Free Science Materials: (for Use During School Year 2011-2012). 52nd annual ed. Educators Progress Service, 2011.