Urquhart, P. (1999). IPM and the citrus industry in South Africa. International Institute for Environment and Development.
Chicago Style (17. basım) AtıfUrquhart, Penny. IPM and the Citrus Industry in South Africa. London: International Institute for Environment and Development, 1999.
MLA (9th ed.) AtıfUrquhart, Penny. IPM and the Citrus Industry in South Africa. International Institute for Environment and Development, 1999.
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