Gray, A., Crentsil, D., Gallat, S. and Gogoe, S. (1997) Survey of yam trading practices and loss assessment in Techiman Market (NRI report no. R6505). Technical Report. Natural Resources Institute, Chatham, UK.

Gray, A. and Kleih, U. (1997) The potential for selected Indian horticultural products on the European market (NRI Marketing Series 11). [Working Paper]

Pritchard, M., Gordon, A., Patterson, G. and Gray, A. (1996) Utilization of small pelagic fish species in Asia. Natural Resources Institute, Chatham, UK. ISBN 0859544672