Leong, G. C., & Morgan, G. C. (1982). Human and economic geography (2nd ed.). Oxford University.
Tohutoru Kātū Chicago (17th ed.)Leong, Goh Cheng, me Gillian C. Morgan. Human and Economic Geography. 2nd ed. Oxford: Oxford University, 1982.
Tohutoro MLA (9th ed.)Leong, Goh Cheng, me Gillian C. Morgan. Human and Economic Geography. 2nd ed. Oxford University, 1982.
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