Logue, D. M., Droessler, E. E., Roscoe, D. W., Vokey, J. R., Rendall, D., & Kunimoto, R. M. (2007). Sexually antithetical song structure in a duet singing wren. Behaviour, 144, 331–350. Leiden, Netherlands: EJ Brill, 1947-. Copy at http://www.tinyurl.com/yysu3qa7