Singh, S.P., Orr, A., Singh, Shailendra and Singh, G. (2008) The economics of direct-seeded rice in eastern India. In: Singh, Y., Singh, V. P., Chauhan, B., Orr, A., Mortimer, A. M., Johnson, D. E. and Hardy, B., (eds.) Direct seeding of rice and weed management in the irrigated rice-wheat cropping system of the Indo-Gangetic Plains. International Rice Research Institute, Los Banos, Laguna, pp. 229-250. ISBN 9789712202360

Riches, Charles R., Orr, Alastair, Johnson, D.E., Mortimer, A.M., Singh, G., Singh, Y., Singh, V.P., Sinha, R.K.P. and Yadav, D.S. (2006) Promotion of integrated weed management for direct-seeded rice on the Gangetic Plains of India. In: Sweetmore, Anne, Kimmins, Francis and Silverside, Penny, (eds.) Perspectives on pests II: achievements of research under UK Department for International Development Crop Protection Programme 2000–05. Natural Resources International Ltd., Aylesford, UK, pp. 173-175. ISBN 0954645278