APA

Bellwald U., . (2003). The Petra Siq. AMMAN: Petra National Trust.

Chicago

Bellwald Ueli, . 2003. The Petra Siq. AMMAN: Petra National Trust.

Harvard

Bellwald U., . (2003). The Petra Siq. AMMAN: Petra National Trust.

MLA

Bellwald Ueli, . The Petra Siq. AMMAN: Petra National Trust. 2003.