APA (7 वां संस्करण) प्रशस्ति पत्र

Mandl, J. J. (2007). Property investment in Bulgaria: Why invest? why not to invest? Diplom.de.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Mandl, Jubilee Jenna. Property Investment in Bulgaria: Why Invest? Why Not to Invest? Hamburg: Diplom.de, 2007.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Mandl, Jubilee Jenna. Property Investment in Bulgaria: Why Invest? Why Not to Invest? Diplom.de, 2007.