R.C., Okoro,; D.E., Bassey; R.A., Umunnah,. Sound Levels And Spectra At Ikot Uduak (MCC) Timber Market, Calabar, Cross River State, Nigeria. European Scientific Journal, ESJ, [S. l.], v. 12, n. 15, p. 231, 2016. DOI: 10.19044/esj.2016.v12n15p231. Disponível em: https://test.eujournal.org/index.php/esj/article/view/7502. Acesso em: 19 apr. 2025.