Marsland, N., Wilson, I. M., Abeyasekera, S., Kleih, U., Lawson-McDowall, J., Burn, R. W., Golob, P., Barahona, C. E., Henderson, S., Conroy, C., Jeffries, D., Warburton, H., Oppong-Nkrumah, K. and Fredua Antoh, E. (2001) Combining quantitative and qualitative survey work. Methodological framework, practical issues, and case studies. Manual. Natural Resources Institute, Chatham, UK.

Orr, A., Mwale, B., Ritchie, J. M., Lawson-McDowall, J. and Chanika, C. S. M. (2000) Learning and livelihoods: The experience of the FSIPM project in southern Malawi. Farming systems integrated pest management project . Natural Resources Institute, Chatham, UK. ISBN 0859545245