Cita APA (7th ed.)
Villarreal, O. (2000). Hotel and catering services: Resource file level 3 (1a. ed.). Macmillan.
Cita Chicago (17th ed.)
Villarreal, Omar. Hotel and Catering Services: Resource File Level 3. 1a. ed. Buenos Aires: Macmillan, 2000.
Cita MLA (9th ed.)
Villarreal, Omar. Hotel and Catering Services: Resource File Level 3. 1a. ed. Macmillan, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.