Armstrong, E. H. (May 1936). "A Method of Reducing Disturbances in Radio Signaling by a System of Frequency Modulation". Proceedings of the IRE. 24 (5). IRE: 689–740. doi:10.1109/JRPROC.1936.227383. S2CID43628076.
Schafer, Erin C.; Bryant, Danielle; Sanders, Katie; Baldus, Nicole; Algier, Katherine; Lewis, Audrey; Traber, Jordan; Layden, Paige; Amin, Aneeqa (June 1, 2014). "Fitting and Verification of Frequency Modulation on Children with Normal Hearing". Journal of the American Academy of Audiology. 25 (6): 529–540. doi:10.3766/jaaa.25.6.3. ISSN1050-0545. PMID25313543. EBSCOhost107832936 – via EBSCOhost.
McArdle, Rachel; Abrams, Harvey B.; Hnath Chisholm, Theresa (2005). "When Hearing Aids Go Bad: An FM Success Story". Journal of the American Academy of Audiology. 16 (10): 809–821. doi:10.3766/jaaa.16.10.5. EBSCOhost106441304 – via EBSCOhost.
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Schafer, Erin C.; Bryant, Danielle; Sanders, Katie; Baldus, Nicole; Algier, Katherine; Lewis, Audrey; Traber, Jordan; Layden, Paige; Amin, Aneeqa (June 1, 2014). "Fitting and Verification of Frequency Modulation on Children with Normal Hearing". Journal of the American Academy of Audiology. 25 (6): 529–540. doi:10.3766/jaaa.25.6.3. ISSN1050-0545. PMID25313543. EBSCOhost107832936 – via EBSCOhost.
McArdle, Rachel; Abrams, Harvey B.; Hnath Chisholm, Theresa (2005). "When Hearing Aids Go Bad: An FM Success Story". Journal of the American Academy of Audiology. 16 (10): 809–821. doi:10.3766/jaaa.16.10.5. EBSCOhost106441304 – via EBSCOhost.
Schafer, Erin C.; Bryant, Danielle; Sanders, Katie; Baldus, Nicole; Algier, Katherine; Lewis, Audrey; Traber, Jordan; Layden, Paige; Amin, Aneeqa (June 1, 2014). "Fitting and Verification of Frequency Modulation on Children with Normal Hearing". Journal of the American Academy of Audiology. 25 (6): 529–540. doi:10.3766/jaaa.25.6.3. ISSN1050-0545. PMID25313543. EBSCOhost107832936 – via EBSCOhost.
Armstrong, E. H. (May 1936). "A Method of Reducing Disturbances in Radio Signaling by a System of Frequency Modulation". Proceedings of the IRE. 24 (5). IRE: 689–740. doi:10.1109/JRPROC.1936.227383. S2CID43628076.
Schafer, Erin C.; Bryant, Danielle; Sanders, Katie; Baldus, Nicole; Algier, Katherine; Lewis, Audrey; Traber, Jordan; Layden, Paige; Amin, Aneeqa (June 1, 2014). "Fitting and Verification of Frequency Modulation on Children with Normal Hearing". Journal of the American Academy of Audiology. 25 (6): 529–540. doi:10.3766/jaaa.25.6.3. ISSN1050-0545. PMID25313543. EBSCOhost107832936 – via EBSCOhost.