Ecdysozoa: Tardigrada: References

Budd, G. E. (2001). Tardigrades as "stem-group arthropods": the evidence from the Cambrian fauna. Zoologischer Anzeiger, 240, 265–279. pdf
Overview.

Cavalier-Smith T (August 1998). "A revised six-kingdom system of life". Biol Rev Camb Philos Soc 73 (3): 203–66. doi:10.1111/j.1469-185X.1998.tb00030.x. PMID 9809012.
Overview.

Grimaldi & Engel. 2005 , Evolution of the Insects
Tardigrada

Mulleretal2005Müller, K. J., Walossek, D. & Zakharov, A. (1995): 'Orsten' type phosphatized soft-integument preservation and a new record from the Middle Cambrian Kuonamka Formation in Siberia. Neues Jb. Geol. Paläont., Abh. 197: 107–118.pdf
Overview, Tardigrada

Nielsen, Claus 2001: Animal Evolution. Second Edition. 563 pp. Oxford University Press.
Overview.

Andreas Schmidt-Rhaesa 2001 Tardigrades – Are They Really Miniaturized Dwarfs? Zool. Anz. 240 (2001): 549–555 pdf

Tudge, Colin 2000: The Variety of Life. Oxford.
Overview.