APA (7th ed.) Citation

(1991). Fodor's ... Vienna & the Danube Valley. Fodor's Travel Guides.

Chicago Style (17th ed.) Citation

Fodor's ... Vienna & the Danube Valley. New York: Fodor's Travel Guides, 1991.

MLA (9th ed.) Citation

Fodor's ... Vienna & the Danube Valley. Fodor's Travel Guides, 1991.

Warning: These citations may not always be 100% accurate.