APA (7 वां संस्करण) प्रशस्ति पत्र

Urhausen, J. (2008). Tourism in Europe: Does age matter? Statistics in focus: Industry, trade and services.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Urhausen, Julia. "Tourism in Europe: Does Age Matter?" Statistics in Focus: Industry, Trade and Services 2008.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Urhausen, Julia. "Tourism in Europe: Does Age Matter?" Statistics in Focus: Industry, Trade and Services, 2008.

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