@Misc{Wiki,
 howpublished = {\url{http://en.wikipedia.org/wiki/Hyla_arborea}}
} 

@Book{Kooy2010,
 author = {Kooijman, S.A.L.M.},
 year = {2010},
 title  = {Dynamic Energy Budget theory for metabolic organisation},
 publisher = {Cambridge Univ. Press, Cambridge},
 pages = {Table 4.2 (page 150), 8.1 (page 300)},
 howpublished = {\url{../../../bib/Kooy2010.html}}
} 

@Book{Gros1994,
 author = {Grosse, W.-R.},
 year = {1994},
 title  = {Der Laubfrosch \emph{Hyla arborea}},
 publisher = {Westarp Wissenschaften},
 series = {Die Neue Brehm-Buecherei},
 volume = {615}
} 

@Misc{amphibiaweb,
 howpublished = {\url{https://amphibiaweb.org/cgi/amphib_query?rel-scientific_name=contains&where-scientific_name=Hyla+arborea}}
} 

@Misc{AnAge,
 howpublished = {\url{http://genomics.senescence.info/species/entry.php?species=Hyla_arborea}}
}