Case Study 10 'A new Russian window to the West - the province of Kaliningrad' has been prepared by Dr Elena Kropinova Immanuel Kant State University of Russia, Kaliningrad, and David Bruce Principal Lecturer in Tourism, Bristol Business School, University of West of England, Bristol pp 717-731
and includes material on the fortified city of Kaliningrad (formerly Koenigsberg) In newly published "The Business of Tourism" 8th Edition Pearson Education
Chris Holloway, R. Davidson, Claire HumphreysApr 2009, Paperback, 792 pages ISBN13: 9780273717102ISBN10: 0273717103£37.99
p271 has reference to the Walled Towns Friendship Circle
from David M Bruce, Convener and Secretary Walled Towns Heritage; Former Academic Adviser, WTFC and EWT- European Walled Towns for friendship and professional co-operation, former Principal Lecturer . UWE,Bristol