Παραπομπή σε μορφή APA (7η εκδ.)

Ulmschneider, P. (2006). Intelligent Life in the Universe: Principles and Requirements Behind Its Emergence (Second Edition.). Springer-Verlag Berlin Heidelberg.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Ulmschneider, Peter. Intelligent Life in the Universe: Principles and Requirements Behind Its Emergence. Second Edition. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2006.

Παραπομπή σε μορφή MLA (8th εκδ.)

Ulmschneider, Peter. Intelligent Life in the Universe: Principles and Requirements Behind Its Emergence. Second Edition. Springer-Verlag Berlin Heidelberg, 2006.