Mierkiewics, D., & technical. (1978). Recent research concerning the development of spatial and geometric concepts. ERIC Clearinghouse for Science.
Lua i Stíl Chicago (17ú heag.)Mierkiewics, Diane, agus technical. Recent Research Concerning the Development of Spatial and Geometric Concepts. Columbus: ERIC Clearinghouse for Science, 1978.
Lua MLA (9ú heag.)Mierkiewics, Diane, agus technical. Recent Research Concerning the Development of Spatial and Geometric Concepts. ERIC Clearinghouse for Science, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.