qayum, a. (1964). cumulative marginal productivity life of plants and the optimal technology. the institute of national planning.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रqayum, a. Cumulative Marginal Productivity Life of Plants and the Optimal Technology. cairo: the institute of national planning, 1964.
एमएलए (9वां संस्करण) प्रशस्ति पत्रqayum, a. Cumulative Marginal Productivity Life of Plants and the Optimal Technology. the institute of national planning, 1964.
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