1.Agriculture Research Data Book – 2002.

2.http://www.iasri.res.in/agridata/02data%5Cchapter%20 3%5Cdb2002tb3_41.htm.

3.Paliwal, J.K. 1997. Recent Development and Future Projections in Tractor Industries in India. Agricultural Engineering Today, 20-21(1-4): 58-64.

4.http://www.indianmba.com/Occasional_Papers/OP127/ op127.html

5.http://en.wikipedia.org/wiki/ Tractors_in_India

6.http://www.123eng.com/forum/viewtopic.php?p=16899

7.Agricultural Census 2011

8.Agricultural Statistics at a Glance, 2011, 2012, 2013.

9.Singh, R.S.,,Surendra Singh and Singh, S.P. 2015. Farm Power and Machinery Availability on Indian Farms. Agricultural Engineering Today, 39(1): 45-56.

10.Singh, R.S. 2013. Custom Hiring and Scope of Entrepreneurship Development in Farm Machinery, AMA, 44(2): 26-32.

11.Singh, R.S., Singh, S.P. and Singh Surendra. 2009. Sale of tractors of different makes in India. Agricultural Engineering Today, 33(3): 20-37.

12.Singh, S.P., Singh, R.S. and Singh Surendra. 2009. Tractor production and sales in India. Agricultural Engineering Today, 33(1): 20-32.

13.Singh Surendra. 2007. Farm machinery - Principles and applications. Directorate of Information and Publications on Agriculture, Indian council of Agricultural Research, New Delhi.

14.Singh Surendra, Singh, R.S. and Singh, S.P. 2010. Farm Power Availability and Agriculture Production Scenario in India. Agricultural Engineering Today, 34(1): 9-20.

15.Tyagi, K.K., Singh Jagbir, Kher, K.K., Jain, V.K. and Singh Surendra. 2010. A project Report on ‘Study on Status and Projection Estimates of Agricultural Implements and Machinery’. IASRI New Delhi.

16.Tractor & Power Tiller Manufacturers Association.