National Fertilizer Development Centre (Pakistan). Planning and Development Division. (1992). Annual fertilizer review. National Fertilizer Development Centre, Planning and Development Division, Govt. of Pakistan.
Παραπομπή σε μορφή Chicago (17η εκδ.)National Fertilizer Development Centre (Pakistan). Planning and Development Division. Annual Fertilizer Review. Islamabad: National Fertilizer Development Centre, Planning and Development Division, Govt. of Pakistan, 1992.
Παραπομπή σε μορφή MLA (8th εκδ.)National Fertilizer Development Centre (Pakistan). Planning and Development Division. Annual Fertilizer Review. National Fertilizer Development Centre, Planning and Development Division, Govt. of Pakistan, 1992.
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