Keng, H., & Keng, R. L. (1990). The concise flora of Singapore: Gymnosperms and dicotyledons. Singapore University Press, National University of Singapore.
Čikaški stil citiranja (17. izdanje)Keng, Hsuan, i Ro-Siu Ling Keng. The Concise Flora of Singapore: Gymnosperms and Dicotyledons. Singapore: Singapore University Press, National University of Singapore, 1990.
MLA način citiranja (8. izdanje)Keng, Hsuan, i Ro-Siu Ling Keng. The Concise Flora of Singapore: Gymnosperms and Dicotyledons. Singapore University Press, National University of Singapore, 1990.
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