Blacker, W., & O'Kelley, F. J. (1837). An essay on the improvement to be made in the cultivation of small farms: By the introduction of green crops, and housefeeding the stock thereon: originally published in an address to the small farmers on the estates of the Earl of Gosford and Colonel Close, in the county of Armagh (Fifth edition.). W. Curry, Jun. and Co. Sackville-Street. London: R. Groombridge; Ridgway and Son. Edinburgh: Fraser and Co. Armagh: M'Watters.

Blacker, William, and Francis J. O'Kelley. An Essay on the Improvement to Be Made in the Cultivation of Small Farms: By the Introduction of Green Crops, and Housefeeding the Stock Thereon: Originally Published in an Address to the Small Farmers on the Estates of the Earl of Gosford and Colonel Close, in the County of Armagh. Fifth edition. W. Curry, Jun. and Co. Sackville-Street. London: R. Groombridge; Ridgway and Son. Edinburgh: Fraser and Co. Armagh: M'Watters, 1837.