Ismail, Z. E and E.H. El-hanify (2009). Construction and testing the seed-punch planter. Farm Machinery and Power. Misr J. Ag. Eng., 26(1): 597-607.
Ismail, Z.E. (2009) Punch planter precision. Poster in Special Issue for The 16th. Annual Conf. of the Misr Society of Agric Eng. "Agricultural Engineering and variables of the present epoch" Ag. Eng. Dept., Fac. Of Ag. CairoUniv. 25 July 2009
Molin, J. P., L. L. Bashford, K. Von Bargen, and L. I. Leviticus. (2002) Design and evaluation of a punch planter for no-till systems. Transactions of the ASAE 41(2): 307-314.
PAMI (Prairie Agricultural Machinery Institute). 1984a. Evaluation Report 357. Humboldt, Saskatchewan, Canada.
PAMI (Prairie Agricultural Machinery Institute). 1984b. Evaluation Report 358. Humboldt, Saskatchewan, Canada.
Schueller, J. K. 1992. A review and integrating analysis of spatially-variable control of crop production. Fertilizer Res. 33: 1-34.
West D. R., C. R. Graces, D. R. Kincer, and J. F. Bradley. 1998. Response corn hybrids to varying plant population densities. Tennessee Farm & Home Sci. 150: 10-14.