Cita APA (7a ed.)

Abraham, J. An upper limit to the photon fraction in cosmic rays above 10 19 eV from the Pierre Auger Observatory.

Cita Chicago Style (17a ed.)

Abraham, J. An Upper Limit to the Photon Fraction in Cosmic Rays Above 10 19 EV from the Pierre Auger Observatory.

Cita MLA (8a ed.)

Abraham, J. An Upper Limit to the Photon Fraction in Cosmic Rays Above 10 19 EV from the Pierre Auger Observatory.