APA (7th ed.) Zitazioa

Betty, G. (2009). Sound and healthy environment in hotels. Global Media.

Chicago Style (17th ed.) Zitazioa

Betty, Gilbert. Sound and Healthy Environment in Hotels. Chandni Chowk, Delhi: Global Media, 2009.

MLA (9th ed.) Zitazioa

Betty, Gilbert. Sound and Healthy Environment in Hotels. Global Media, 2009.