Fisher, Ronald A. (1921). ") Studies in Crop Variation. I. An Examination of the Yield of Dressed Grain from Broadbalk". Journal of Agricultural Science. 11 (2): 107–135. doi:10.1017/S0021859600003750. hdl:2440/15170. S2CID86029217.
Fisher, Ronald A. (1923). ") Studies in Crop Variation. II. The Manurial Response of Different Potato Varieties". Journal of Agricultural Science. 13 (3): 311–320. doi:10.1017/S0021859600003592. hdl:2440/15179. S2CID85985907.
Fisher, Ronald A. (1921). ") Studies in Crop Variation. I. An Examination of the Yield of Dressed Grain from Broadbalk". Journal of Agricultural Science. 11 (2): 107–135. doi:10.1017/S0021859600003750. hdl:2440/15170. S2CID86029217.
Fisher, Ronald A. (1923). ") Studies in Crop Variation. II. The Manurial Response of Different Potato Varieties". Journal of Agricultural Science. 13 (3): 311–320. doi:10.1017/S0021859600003592. hdl:2440/15179. S2CID85985907.
Fisher, Ronald A. (1921). ") Studies in Crop Variation. I. An Examination of the Yield of Dressed Grain from Broadbalk". Journal of Agricultural Science. 11 (2): 107–135. doi:10.1017/S0021859600003750. hdl:2440/15170. S2CID86029217.
Fisher, Ronald A. (1923). ") Studies in Crop Variation. II. The Manurial Response of Different Potato Varieties". Journal of Agricultural Science. 13 (3): 311–320. doi:10.1017/S0021859600003592. hdl:2440/15179. S2CID85985907.