Upton, M. (1996). The economics of tropical farming systems. Cambridge University Press.
Chicago-čujuhus (17. p.)Upton, Martin. The Economics of Tropical Farming Systems. Cambridge ; New York: Cambridge University Press, 1996.
MLA-čujuhus (9. p.)Upton, Martin. The Economics of Tropical Farming Systems. Cambridge University Press, 1996.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.