المؤلفون: Ali, Ahmed Abou M. G.
المصدر: :105-118
URL الوصول: http://elibrary.worldbank.org/doi/pdf/10.1596/978-0-8213-8970-6http://elibrary.worldbank.org/doi/abs/10.1596/9780821389706_CH07http://elibrary.worldbank.org/doi/pdf/10.1596/9780821389706_CH07http://elibrary.worldbank.org/doi/abs/10.1596/978-0-8213-8970-6
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