Bibliografia
Principal
- Connor, D., R. S. Loomis and K. G. Cassman (2011) Crop Ecology. Cambridge University Press. 562 pp.
- Raeburn, J. R. (1984) Agriculture. Foundations, principles and development. John Wiley and Sons. 329 pp.
- Shippen, J. M., C. R. Ellin and C. H. Clover (1980) Basic Farm machinery. Pergamon Press. 288 pp.
- Spedding, C. R. W. (1996) Agriculture and the citizen. Chapman & Hall. 283 pp.