Bartels, J., & International Union of Geodesy and Geophysics. Association of Geomagnetism and Aeronomy. (1962). Collection of Geomagnetic Planetary Indices Kp and Derived Indices, Ap and Cp for the years 1932 to 1961 by Julius Bartels. North-Holland Publishing.
Cita Chicago Style (17a ed.)Bartels, Julius, y International Union of Geodesy and Geophysics. Association of Geomagnetism and Aeronomy. Collection of Geomagnetic Planetary Indices Kp and Derived Indices, Ap and Cp for the Years 1932 to 1961 by Julius Bartels. Amsterdam: North-Holland Publishing, 1962.
Cita MLA (9a ed.)Bartels, Julius, y International Union of Geodesy and Geophysics. Association of Geomagnetism and Aeronomy. Collection of Geomagnetic Planetary Indices Kp and Derived Indices, Ap and Cp for the Years 1932 to 1961 by Julius Bartels. North-Holland Publishing, 1962.
