The Cruise Line Industry
http://www.cruiseindustrywire.com/HNR-pop.html
http://ats-sea.agr.gc.ca/us/4120_e.htm
http://www.cruiseindustrywire.com/article36526.html
http://www.cruiseindustrywire.com/HNR-category-category-Trends.html
http://www.cruiseindustrynews.com/annual-cruise-industry-report.html
http://www.cruiseindustrynews.com/cruise-news-articles.html
http://www.people.cornell.edu/pages/rjk34/Research/Carnival%20Cruise%20Lines%20Burnishing%20the%20Brand.pdf [ free version: http://www.allbusiness.com/accommodation-food-services/1190122-1.html ]
http://gttp.org/docs/HowToWriteAGoodCase.pdf
http://www.gttp.org/index.html
Womack, James P., Daniel T. Jones & Daniel Roos. The Machine That Changed the World. Maxwell Macmillan International. 1990.