Webb, S. (2015). If the Universe Is Teeming with Aliens ... WHERE IS EVERYBODY?: Seventy-Five Solutions to the Fermi Paradox and the Problem of Extraterrestrial Life (2nd ed. 2015.). Springer International Publishing : Imprint: Springer.
Παραπομπή σε μορφή Chicago (17η εκδ.)Webb, Stephen. If the Universe Is Teeming with Aliens ... WHERE IS EVERYBODY?: Seventy-Five Solutions to the Fermi Paradox and the Problem of Extraterrestrial Life. 2nd ed. 2015. Cham: Springer International Publishing : Imprint: Springer, 2015.
Παραπομπή σε μορφή MLA (8th εκδ.)Webb, Stephen. If the Universe Is Teeming with Aliens ... WHERE IS EVERYBODY?: Seventy-Five Solutions to the Fermi Paradox and the Problem of Extraterrestrial Life. 2nd ed. 2015. Springer International Publishing : Imprint: Springer, 2015.
