National Fertilizer Development Centre (Pakistan). Planning and Development Division. (1992). Annual fertilizer review. National Fertilizer Development Centre, Planning and Development Division, Govt. of Pakistan.
Chicago-referens (17:e uppl.)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.
MLA-referens (8:e uppl.)National Fertilizer Development Centre (Pakistan). Planning and Development Division. Annual Fertilizer Review. National Fertilizer Development Centre, Planning and Development Division, Govt. of Pakistan, 1992.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.