Urquhart, P. (1999). IPM and the citrus industry in South Africa. International Institute for Environment and Development.
Citazione stile Chigago Style (17a edizione)Urquhart, Penny. IPM and the Citrus Industry in South Africa. London: International Institute for Environment and Development, 1999.
Citatione MLA (9a ed.)Urquhart, Penny. IPM and the Citrus Industry in South Africa. International Institute for Environment and Development, 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.