International Labour Office. (1976). Careers in the hotel and tourism sector. ILO.
Lua i Stíl Chicago (17ú heag.)International Labour Office. Careers in the Hotel and Tourism Sector. Geneva: ILO, 1976.
Lua MLA (8ú heag.)International Labour Office. Careers in the Hotel and Tourism Sector. ILO, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.