Davis, B. Spatial reasoning in the early years: Principles, assertions, and speculations (1a ed.).
Chicago Style (17. basım) AtıfDavis, Brent. Spatial Reasoning in the Early Years: Principles, Assertions, and Speculations. 1a ed.
MLA (8th ed.) AtıfDavis, Brent. Spatial Reasoning in the Early Years: Principles, Assertions, and Speculations. 1a ed.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..