Ooi, J. (1983). Natural resources in tropical countries. Singapore : Singapore University Press.
Citazione stile Chigago Style (17a edizione)Ooi, Jin-Bee. Natural Resources in Tropical Countries. Singapore : Singapore University Press, 1983.
Citatione MLA (9a ed.)Ooi, Jin-Bee. Natural Resources in Tropical Countries. Singapore : Singapore University Press, 1983.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.