Parks SE, Cusano DA, Van Parijs SM, Nowacek DP. Acoustic crypsis in communication by North Atlantic right whale mother?calf pairs on the calving grounds.  2019. Available at: https://royalsocietypublishing.org/doi/10.1098/rsbl.2019.0485.

Rycyk AM, Deutsch CJ, Barlas ME, ym. Manatee behavioral response to boats. Marine Mammal Science. 2018;34(4):924 - 962. Available at: http://doi.wiley.com/10.1111/mms.v34.4.