Dines, James; Mesnick, Sarah; Ralls, Katherine; May-Collado, Laura; Agnarsson, Ingi; Dean, Matthew (2015). "A trade-off between precopulatory and postcopulatory trait investment in male cetaceans". Evolution69 (6): 1560–1572. doi:10.1111/evo.12676. பப்மெட்:25929734.
Miller, P. J. O.; Aoki, K.; Rendell, L. E.; Amano, M. (2008). "Stereotypical resting behavior of the sperm whale". Current Biology18 (1): R21–R23. doi:10.1016/j.cub.2007.11.003. பப்மெட்:18177706.
Dines, James; Mesnick, Sarah; Ralls, Katherine; May-Collado, Laura; Agnarsson, Ingi; Dean, Matthew (2015). "A trade-off between precopulatory and postcopulatory trait investment in male cetaceans". Evolution69 (6): 1560–1572. doi:10.1111/evo.12676. பப்மெட்:25929734.
Miller, P. J. O.; Aoki, K.; Rendell, L. E.; Amano, M. (2008). "Stereotypical resting behavior of the sperm whale". Current Biology18 (1): R21–R23. doi:10.1016/j.cub.2007.11.003. பப்மெட்:18177706.