Quality assurance II. Educational Institute of the American Hotel & Motel Association.
Chicago-viite (17. p.)Quality Assurance II. East Lansing, Mich: Educational Institute of the American Hotel & Motel Association.
MLA-viite (9. p.)Quality Assurance II. Educational Institute of the American Hotel & Motel Association.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.