Allen, J. H., Abston, C. C., & Morris, L. D. (1977). Geomagnetic data for March 1976: (AE (7) indices and stacked magnetograms). World Data Center A for Solar-Terrestrial Physics, NOAA.
Chicago Style (17th ed.) CitationAllen, J. H., C. C. Abston, and Leslie D. Morris. Geomagnetic Data for March 1976: (AE (7) Indices and Stacked Magnetograms). Boulder, Colorado: World Data Center A for Solar-Terrestrial Physics, NOAA, 1977.
MLA (9th ed.) CitationAllen, J. H., et al. Geomagnetic Data for March 1976: (AE (7) Indices and Stacked Magnetograms). World Data Center A for Solar-Terrestrial Physics, NOAA, 1977.
Warning: These citations may not always be 100% accurate.