1. Achard, F.K. 1786. Chemische Untersuchung des Torfs. Grell’s Chem. Ann.
2, 391–403.
2. Aiken, G.R. 1985. Isolation and concentration techniques for aquatic humus substances. In G.R. Aiken, D.M. McKnight, R.L. Wershaw and P. MacCarthy (eds.), Humic Substances in Soil, Sediment, and Water. Wiley, New York. pp. 363–408.
3. Aiken, G.R. and Gillam, A.H. 1989. Determination of molecular weights of humic substances by colligative property measurements. In M.H.B. Hayes, P. MacCarthy, R.L. Malcolm and R.S. Swift (eds.), Humic Substances II. In Search of Structure. Wiley, Chichester. Chapter 18. In press.
4. Aiken, G.R., McKnight, D.M., Wershaw, R.L. and MacCarthy, P. (eds.) 1985. Humic Substances in Soil, Sediment, and Water. Wiley, New York.
5. Aiken, G.R., McKnight, D.M., Wershaw, R.L. and MacCarthy, P. 1985. An introduction to humic substances in soil, sediment, and water. In G.R. Aiken, D.M. McKnight, R.L. Wershaw and P. MacCarthy (eds.), Humic Substances in Soil, Sediment, and Water. Wiley, New York, pp. 1–9.