Doyle, Lester R.; Larry N. Gleason (juni 1991). «Suckers and Other Bursal Structures of Pomphorhynchus bulbocolli and Acanthocephalus dirus (Acanthocephala)». The Journal of Parasitology. 77 (3): 437–40. JSTOR3283132. PMID2040955. doi:10.2307/3283132.
Obst, Matthias; Funch, Peter (6. januar 2003). «Dwarf male of symbion pandora (cycliophora)». Journal of Morphology. 255 (3): 261–78. PMID12520546. doi:10.1002/jmor.10040.
Doyle, Lester R.; Larry N. Gleason (juni 1991). «Suckers and Other Bursal Structures of Pomphorhynchus bulbocolli and Acanthocephalus dirus (Acanthocephala)». The Journal of Parasitology. 77 (3): 437–40. JSTOR3283132. PMID2040955. doi:10.2307/3283132.
Doyle, Lester R.; Larry N. Gleason (juni 1991). «Suckers and Other Bursal Structures of Pomphorhynchus bulbocolli and Acanthocephalus dirus (Acanthocephala)». The Journal of Parasitology. 77 (3): 437–40. JSTOR3283132. PMID2040955. doi:10.2307/3283132.
Obst, Matthias; Funch, Peter (6. januar 2003). «Dwarf male of symbion pandora (cycliophora)». Journal of Morphology. 255 (3): 261–78. PMID12520546. doi:10.1002/jmor.10040.