Eitemau Tebyg: Black Book - Restaurant Industry Trends (June 1980)
- Black Book - Restaurant Industry Trends (December 1980)
- Black Book - Restaurant Industry Trends (October 1980)
- Black Book - Restaurant Industry Trends (July 1980)
- Black Book - Restaurant Industry Trends (August 1980)
- Black Book - Restaurant Industry Trends (March 1980)
- Black Book - Restaurant Industry Trends (April 1980)