1. Stylo, le boulan de soc;Anonymous;Factory folder,1959
2. A new concept in soil care: interview;Anonymous;J. Pidgeon. Reprint Arable Farming,1981
3. The ploughing performance predictor monography: devised by B.D. Witney and K.E. Oskoni;Anonymous;Power Farming,1982
4. What's beyond the horizon in field equipment?;Anonymous;Agric. Eng.,1983
5. Themadag Effecten van diepe grondbewerking in de akkerbouw en de vollegrondsgroenteteelt;Anonymous;PAGV-Verlag,1985