Lean, G. A. (1980). The training of spatial abilities: A bibliography. Mathematics Education Centre, Papua New Guinea University of Technology.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLean, G. A. The Training of Spatial Abilities: A Bibliography. Lae: Mathematics Education Centre, Papua New Guinea University of Technology, 1980.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLean, G. A. The Training of Spatial Abilities: A Bibliography. Mathematics Education Centre, Papua New Guinea University of Technology, 1980.
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