HUDMAN LLOYD. (2003). GEOGRAPHY OF TRAVEL & TOURISM (4TH.). DELMAR CENGAGE LEARNING.
Lua i Stíl Chicago (17ú heag.)HUDMAN LLOYD. GEOGRAPHY OF TRAVEL & TOURISM. 4TH. USA: DELMAR CENGAGE LEARNING, 2003.
Lua MLA (9ú heag.)HUDMAN LLOYD. GEOGRAPHY OF TRAVEL & TOURISM. 4TH. DELMAR CENGAGE LEARNING, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.