Butt N., DJ Johnson. 2013. 'Overview of shipping activity in the Sulu-Sulawesi Region' on behalf of UNESCO Sulu Sea mission.
Pike K., Butt N., Pryce-Roberts N., Vigar N., 2013. '15 years of shipping accidents: a review for WWF'. Available from:http://awsassets.panda.org/downloads/15_years_of_shipping_accidents_a_review_for_wwf_.pdf
Pike, K., N. Butt, D. Johnson and S. Walmsley, 2011. 'Report on Global Shipping Initiatives: Audit and Overview.' Available from: http://awsassets.panda.org/downloads/sustainable_shipping_initiatives_report_1.pdf
Butt N, Gallagher A, Vigar N, Wright P. Thatcher K. , 2009. 'Evaluation of the Wadden Sea Particularly sensitive Sea Area'. On behalf of the Common Wadden Sea Secretariat. Available from: http://www.waddensea-secretariat.org/sites/default/files/downloads/4_pssa_evaluation_final_report_21_jan.pdf
Butt, N., N Vigar. P, Wright (2010) 'Shipping and Harbours Chapter for Quality Status Report: Wadden Sea 2009'
Butt, N., 2007. 'The impact of cruise ship generated waste on home ports and ports of call: A study of Southampton.' Marine Policy. 31(2007) pp. 591-598.
Butt, N., 2007. 'Forecasting nitrogen deposition from shipping and transport in the OSPAR region'. Desk study on behalf of OSPAR commission identifying methods and models available that may be used in future to forecast levels of nitrogen deposition in the sea. London: Ospar.
Butt, N. and D. Johnson, 2006. 'The Sea Empress disaster: 10 years on.' An overview of shipping activities in UK waters. Guildford: WWF-UK.
Butt, N., 2006. 'Firth of Forth consultation on Ship to Ship Transfers.' Consultation response to the MCA on behalf of WWF-UK to enable Policy Recommendation.
Butt, N., 2006. 'Ship to Ship Transfers.' Guildford: WWF-UK.
Butt N., D. Johnson and S. Walmsley, 2005. 'Protecting Marine Protected Areas from the threats posed by International Shipping.' Conference proceedings IMPAC1. Geelong, Australia.