Geografiya va tabiiy resurslar

Foydalanilgan adabiyotlar.

1. 
   ^ Matt Rosenberg (14 January 2007). "Sectors of the Economy". About.com. Retrieved 20 April 2012.
   
2. 
   ^ Chand, S. N. (2006). Dictionary of economics. New Delhi: Atlantic Publishers & Distributors. p. 268. ISBN 81-269-0535-2. OCLC 297507928.
   
3. 
   ^ "primary producer". CollinsDictionary.com. HarperCollins. Retrieved 2019-12-10.
   
4. 
   ^ Kjeldsen-Kragh, Søren (2007). The Role of Agriculture in Economic Development: The Lessons of History. Copenhagen Business School Press DK. p. 73. ISBN 978-87-630-0194-6.
   
5. 
   ^ "Agriculture, forestry, and fishing, value added (% of GDP) | Sub-Saharan Africa". World Bank Open Data. 2018. Retrieved 2019-07-14.
   
6. 
   ^ "Agriculture, forestry, and fishing, value added (% of GDP) | North America". World Bank Open Data. 2018. Retrieved 2019-07-14.
   
7. 
   ^ "Employment in agriculture (% of total employment) (modeled ILO estimate) - Data". data.worldbank.org.
   
8. 
   ^ H Dwight H. Perkins: Proceedings of the Academy of Political Science, Vol. 31, No. 1, China's Developmental Experience (March 1973)
   
9. 
   ^ R.P. Mohanty & R.R. Lakhe (1 January 2001). TQM in the Service Sector. Jaico Publishing House. pp. 32–33. ISBN 978-81-7224-953-3. Retrieved 1 May 2013.
   
10. 
    ^ Definition by the European Foundation for the Improvement of Living and Working Conditions Archived July 20, 2014, at the Wayback Machine
    
11. 
    ^ The Borderless World: Power and Strategy in the Interlinked Economy.
    

^ De Soto, Glenn (2006). Fragmented: the Demise of Unionized Construction. Lulu.com. p. 64. ISBN 9781847285775.^{[self-published source}

Internet manbalar.

1. 
   Bizfluent.com
   
2. 
   En.wikipedia.org
   
3. 
   Quicknomics.com
   
4. 
   Reference.com
   
5. 
   Studylib.net
   
6. 
   Thughtco.com
   
7. 
   Wiki2.org
   
8. 
   www.bestreferat.ru
   
9. 
   www.clearias.com
   
10. 
    www.economicshelp.org
    
11. 
    www.worldatlas.com