Sessler, G.M.; West, J.E. (1962). "Self-Biased Condenser Microphone with High Capacitance". Journal of the Acoustical Society of America. 34 (11): 1787–1788. Bibcode:1962ASAJ...34.1787S. doi:10.1121/1.1909130.
Sena, E. De; Hacihabiboglu, H.; Cvetkovic, Z. (January 2012). "On the Design and Implementation of Higher Order Differential Microphones – IEEE Journals & Magazine". IEEE Transactions on Audio, Speech, and Language Processing. 20 (1): 162–174. doi:10.1109/TASL.2011.2159204. S2CID206602089.
Sessler, G.M.; West, J.E. (1962). "Self-Biased Condenser Microphone with High Capacitance". Journal of the Acoustical Society of America. 34 (11): 1787–1788. Bibcode:1962ASAJ...34.1787S. doi:10.1121/1.1909130.
Sena, E. De; Hacihabiboglu, H.; Cvetkovic, Z. (January 2012). "On the Design and Implementation of Higher Order Differential Microphones – IEEE Journals & Magazine". IEEE Transactions on Audio, Speech, and Language Processing. 20 (1): 162–174. doi:10.1109/TASL.2011.2159204. S2CID206602089.