Cole AG, Hall BK (2004). "The nature and significance of invertebrate cartilages revisited: distribution and histology of cartilage and cartilage-like tissues within the Metazoa". Zoology. 107 (4): 261–73. Bibcode:2004Zool..107..261C. doi:10.1016/j.zool.2004.05.001. PMID16351944.
Cole AG, Hall BK (2004). "The nature and significance of invertebrate cartilages revisited: distribution and histology of cartilage and cartilage-like tissues within the Metazoa". Zoology. 107 (4): 261–73. Bibcode:2004Zool..107..261C. doi:10.1016/j.zool.2004.05.001. PMID16351944.
Cole AG, Hall BK (2004). "The nature and significance of invertebrate cartilages revisited: distribution and histology of cartilage and cartilage-like tissues within the Metazoa". Zoology. 107 (4): 261–73. Bibcode:2004Zool..107..261C. doi:10.1016/j.zool.2004.05.001. PMID16351944.