Leong, G. C., & Morgan, G. C. (1982). Human and economic geography (2nd ed.). Oxford University.
Lua i Stíl Chicago (17ú heag.)Leong, Goh Cheng, agus Gillian C. Morgan. Human and Economic Geography. 2nd ed. Oxford: Oxford University, 1982.
Lua MLA (9ú heag.)Leong, Goh Cheng, agus Gillian C. Morgan. Human and Economic Geography. 2nd ed. Oxford University, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.