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Groot, J.C.J., Ploeg, J.D. van der, Verhoeven, F.P.M., & Lantinga, E.A. (2007). Interpretation of results from on-farm experiments: manure-nitrogen recovery on grassland as affected by manure quality and application technique. 1. An agronomic analysis. NJAS Wageningen Journal of Life Sciences, 54(3), 235-254.

Ploeg, J.D. van der, Groot, J.C.J., Verhoeven, F.P.M. & Lantinga, E.A. (2007). Interpretation of results from on-farm experiments: manure-nitrogen recovery on grassland as affected by manure quality and application technique. 2. A sociological analysis. NJAS Wageningen Journal of Life Sciences, 54(3), 255-268.

Ploeg, J.D. van der (2007). The mystery of the local in times of empire. In J.A.C. van Ophem & C.H.A. Verhaar (Eds.), On the mysteries of research : essays in various fields of Humaniora (pp. 85-101). Leeuwarden: Fryske Akademy.