Tonge, R. (1993). How to publish profitable tourist guidebooks (4th ed.). Gull Publishing Services.
Citazione stile Chigago Style (17a edizione)Tonge, Rob. How to Publish Profitable Tourist Guidebooks. 4th ed. Coolum Beach, Qld.: Gull Publishing Services, 1993.
Citatione MLA (8a ed.)Tonge, Rob. How to Publish Profitable Tourist Guidebooks. 4th ed. Gull Publishing Services, 1993.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.