APA
Ryan C., . (1980). An introduction to hotel and catering economics. Cheltenham: Stanley Thornes.
Chicago
Ryan Chris, . 1980. An introduction to hotel and catering economics. Cheltenham: Stanley Thornes.
Harvard
Ryan C., . (1980). An introduction to hotel and catering economics. Cheltenham: Stanley Thornes.
MLA
Ryan Chris, . An introduction to hotel and catering economics. Cheltenham: Stanley Thornes. 1980.