Sheldon LD, Chin EH, Gill SA, Schmaltz G, Newman AEM, Soma KK. 2008. Effects of blood collection on wild birds: an update. Journal of Avian Biology, 39:369-378. 

Sheldon LD, Chin EH, Gill SA, Schmaltz G, Newman AEM, Soma KK. 2008. Effects of blood collection on wild birds: an update. Journal of Avian Biology, 39:369-378