Gilliland, T., Kirby, S., & Smith, N. (1938). Characteristics of the Ionosphere at Washington, D.C., April 1938. Proceedings of the Institute of Radio Engineers, 26(6), 781-785. https://doi.org/10.1109/JRPROC.1938.228328
Chicago Style (17th ed.) CitationGilliland, T.R, S.S Kirby, and N. Smith. "Characteristics of the Ionosphere at Washington, D.C., April 1938." Proceedings of the Institute of Radio Engineers 26, no. 6 (1938): 781-785. https://doi.org/10.1109/JRPROC.1938.228328.
MLA (9th ed.) CitationGilliland, T.R, et al. "Characteristics of the Ionosphere at Washington, D.C., April 1938." Proceedings of the Institute of Radio Engineers, vol. 26, no. 6, 1938, pp. 781-785, https://doi.org/10.1109/JRPROC.1938.228328.
Warning: These citations may not always be 100% accurate.