Não informado. (1944). Ionospheric data. U.S. Department of Commerce, National Bureau of Standards, Central Radio Propagation Laboratory.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Ionospheric Data. Washington: U.S. Department of Commerce, National Bureau of Standards, Central Radio Propagation Laboratory, 1944.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Ionospheric Data. U.S. Department of Commerce, National Bureau of Standards, Central Radio Propagation Laboratory, 1944.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.