RYCHEL, Amanda L, Shannon E Smith, Heather T Shimamoto, Billie J Swalla. Evolution and development of the chordates: collagen and pharyngeal cartilage. Molecular Biology and Evolution. 2006-03, roč. 23, čís. 3, s. 541–549. Dostupné online [cit. 2010-03-30]. ISSN0737-4038. doi:10.1093/molbev/msj055.
RYCHEL, Amanda L, Billie J Swalla. Development and evolution of chordate cartilage. Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution. 2007-05-15, roč. 308, čís. 3, s. 325–335. Dostupné online [cit. 2010-03-30]. ISSN1552-5007. doi:10.1002/jez.b.21157.
RYCHEL, Amanda L, Shannon E Smith, Heather T Shimamoto, Billie J Swalla. Evolution and development of the chordates: collagen and pharyngeal cartilage. Molecular Biology and Evolution. 2006-03, roč. 23, čís. 3, s. 541–549. Dostupné online [cit. 2010-03-30]. ISSN0737-4038. doi:10.1093/molbev/msj055.
RYCHEL, Amanda L, Billie J Swalla. Development and evolution of chordate cartilage. Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution. 2007-05-15, roč. 308, čís. 3, s. 325–335. Dostupné online [cit. 2010-03-30]. ISSN1552-5007. doi:10.1002/jez.b.21157.
RYCHEL, Amanda L, Shannon E Smith, Heather T Shimamoto, Billie J Swalla. Evolution and development of the chordates: collagen and pharyngeal cartilage. Molecular Biology and Evolution. 2006-03, roč. 23, čís. 3, s. 541–549. Dostupné online [cit. 2010-03-30]. ISSN0737-4038. doi:10.1093/molbev/msj055.
RYCHEL, Amanda L, Billie J Swalla. Development and evolution of chordate cartilage. Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution. 2007-05-15, roč. 308, čís. 3, s. 325–335. Dostupné online [cit. 2010-03-30]. ISSN1552-5007. doi:10.1002/jez.b.21157.