Comparison of soil properties as influenced by organic and conventional farming systems.
J.P. Reganold. 1988. Amer. J. Alternative Agr. 3:144-155.
J.P. Reganold. 1988. Amer. J. Alternative Agr. 3:144-155.
J.P. Reganold, L.F. Elliott, and Y. Unger. 1987. Nature 330:370-372.