Smart SM, Ashmore MR, Hornung M. Detecting the signal of atmospheric N  deposition in recent national-scale vegetation change across Britain. Water, Air and  Soil Pollution: Focus. 2004  ;4:269?278.

Haines-Young RH, Barr CJ, Black HIJ, Briggs DJ, Bunce RGH, Clarke RT, Cooper A, Dawson FH, Firbank LG, Fuller RM, et al. Accounting for nature: assessing habitats in the UK countryside. London: DETR; 2000.

Haines-Young RH, Barr CJ, Black HIG, Briggs DJ, Bunce RGH, Clarke RT, Cooper A, Dawson FH, Firbanks LG, Fuller RM, et al. Accounting for nature: assessing habitats in the UK countryside. London: DETR; 2000.

Sutton MA, Milford C, Dragosits U, Place CJ, Singles RJ, Smith RI, Pitcairn CER, Fowler D, Hill J, ApSimon HM, et al. Dispersion, deposition and impacts of atmospheric ammonia: quantifying local budgets and spatial variability. Environmental Pollutution (Nitrogen Conference Special Issue). 1998  ;102:349-361.

Bobbink R, Hornung M, Roelofs JGM. The effects of air-borne nitrogen pollutants on species diversity in natural and semi-natural European vegetation. Journal of Ecology. 1998  ;86:717-738.

Bobbink R, Hornung M, Roelofs JGM.  Empirical nitrogen critical loads for natural and semi-natural ecosystems. Berlin: Umweltbundesamt; 1996 pp. 71-96. .

Hornung M, Bull KR, Cresser MS, Hall J, Langan SJ, Loveland PJ, Smith C. An empirical map of acidity for soils in Great Britain. Environmental Pollution. 1995  ;90:301-310.

Bobbink R, Roelofs JGM. Empirical nitrogen critical loads: update since Lokeberg (1992). (Hornung M, Sutton MA, Wilson RB). Bush: Institute of Terrestrial Ecology; 1995 pp. 9-19.

Hornung M, Sutton MA, Wilson [E]RB. Mapping and modelling of critical loads for nitrogen - a workshop report. Cumbria, UK: Institute of Terrestrial Ecology, Edinburgh, UK.; 1995.

Hornung M, Bull KR, Cresser MS, Loveland PJ, Langan SJ, Reynolds B, Robertson WH, Battarbee (E)RW. Acid Rain and its Impact: The Critical Loads Debate. In: London: Environmental Change Research Centre/ENSIS; 1994. pp. 43-51.

Cresser MS, Smith C, Sanger L. Critical loads for peat soils. In: Hornung M, Skeffington RA Critical Loads - Concepts and Applications. Critical Loads - Concepts and Applications. London: HMSO; 1993.

Cresser MS, Smith C, Sanger L. Critical loads for peat soils. Symposium 28th ed. (Hornung M, Skeffington RA). London.: Institute of Terrestrial Ecology; 1993.