Nakajima Y; Humphreys T; Kaneko H; Tagawa K. (January 2004). "Development and neural organization of the tornaria larva of the Hawaiian hemichordate, Ptychodera flava". Zoological Science21 (1): 69–78. doi:10.2108/0289-0003(2004)21[69:DANOOT]2.0.CO;2. பப்மெட்:14745106.
Nakajima Y; Humphreys T; Kaneko H; Tagawa K. (January 2004). "Development and neural organization of the tornaria larva of the Hawaiian hemichordate, Ptychodera flava". Zoological Science21 (1): 69–78. doi:10.2108/0289-0003(2004)21[69:DANOOT]2.0.CO;2. பப்மெட்:14745106.