Παραπομπή APA

Campbell, W. H. (1989). Quiet daily geomagnetic feilds. Birkhauser Verlag.

Παραπομπή Chicago Style

Campbell, Wallace H. Quiet Daily Geomagnetic Feilds. Basel: Birkhauser Verlag, 1989.

Παραπομπή MLA

Campbell, Wallace H. Quiet Daily Geomagnetic Feilds. Birkhauser Verlag, 1989.