MLA

Deliso, Christopher, and Richard Watkins. Bulgaria. 3rd ed. Victoria: Lonely Planet Publications pty Ltd, 2008.

APA

Deliso, C., & Watkins, R. (2008). Bulgaria. 3rd ed. Victoria: Lonely Planet Publications pty Ltd.

Chicago

Deliso, Christopher, and Richard Watkins. Bulgaria. 3rd ed. Victoria: Lonely Planet Publications pty Ltd, 2008.