qayum, a. (1964). cumulative marginal productivity life of plants and the optimal technology. the institute of national planning.
Παραπομπή σε μορφή Chicago (17η εκδ.)qayum, a. Cumulative Marginal Productivity Life of Plants and the Optimal Technology. cairo: the institute of national planning, 1964.
Παραπομπή σε μορφή MLA (9th εκδ.)qayum, a. Cumulative Marginal Productivity Life of Plants and the Optimal Technology. the institute of national planning, 1964.