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

@Book{Kooy2010,
 author = {Kooijman, S.A.L.M.},
 year = {2010},
 title  = {Dynamic Energy Budget theory for metabolic organisation},
 publisher = {Cambridge Univ. Press, Cambridge},
 howpublished = {\url{../../../bib/Kooy2010.html}}
} 

@Misc{fishbase,
 howpublished = {\url{https://www.fishbase.se/summary/Esox-americanus.html}}
} 

@Misc{fishesoftexas,
 howpublished = {\url{http://txstate.fishesoftexas.org/esox americanus.htm}}
}