N.K. Singh has authored The New Bihar which is a collection of essays on the state's model of development, shedding light on its achievements, shortcomings, and the challenges ahead. His other publication, "Not by Reason Alone", is a commentary on Indian political economy, analysing the various reforms pertaining to infrastructure, finance, government policies and Centre-state relations. His first book, "The Politics of Change", gives the reader a window into Indian politics and economy, providing insights into the realities of coalition politics and international fault lines.