Davis, B. Spatial reasoning in the early years: Principles, assertions, and speculations (1a ed.).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDavis, Brent. Spatial Reasoning in the Early Years: Principles, Assertions, and Speculations. 1a ed.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDavis, Brent. Spatial Reasoning in the Early Years: Principles, Assertions, and Speculations. 1a ed.
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