Παραπομπή σε μορφή APA (7η εκδ.)

Freund, F. T. (2007). Pre-earthquake signals – Part I: Deviatoric stresses turn rocks into a source of electric currents. Copernicus Publications.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Freund, F. T. Pre-earthquake Signals – Part I: Deviatoric Stresses Turn Rocks into a Source of Electric Currents. Copernicus Publications, 2007.

Παραπομπή σε μορφή MLA (9th εκδ.)

Freund, F. T. Pre-earthquake Signals – Part I: Deviatoric Stresses Turn Rocks into a Source of Electric Currents. Copernicus Publications, 2007.