APA-čujuhus (7. p.)
Villarreal, O. (1999). Hotel and catering services: Resource file level 1 (1a. ed.). Macmillan.
Chicago-čujuhus (17. p.)
Villarreal, Omar. Hotel and Catering Services: Resource File Level 1. 1a. ed. Buenos Aires: Macmillan, 1999.
MLA-čujuhus (9. p.)
Villarreal, Omar. Hotel and Catering Services: Resource File Level 1. 1a. ed. Macmillan, 1999.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.