1. Farbatlas der Schädlinge an Zierpflanzen.;Alford,1997
2. Alien terrestrial planarians in England & Wales, and implications for horticultural trade.;Alford;Brighton Crop Prot. Conf. - Pests & Diseases,1996
3. The potential impact of New Zealand flatworm (Artioposthia triangulata) on agriculture and the environment in England & Wales. Project report no. OCS 9323.;Alford,1995
4. Living with the New Zealand flatworm.;Alston;New Farm. Grow.,1991
5. Code of practice to prevent the spread of non-indigenous flatworms.,1996