[Taxacom] Domestic Chicken

[Jeffery.T.Alfred at aphis.usda.gov]

To all, 
I am currently trying to compose a taxonomic list of various species and 
have run into some trouble. I am finding multiple names used for domestic 
chickens. I have seen Gallus gallus, Gallus gallus domesticus, and Gallus 
domesticus. Yet I cannot find an authoritative source to say which is the 
currently accepted name. If someone could send me the citation for a 
source that would have this information I would greatly appreciate it. 
Also can anyone tell me of a good source for reptile names? I found a good 
source for reptiles of North America but any species not found here I have 
to hunt down individual source information on.
Thank you for your time,

Jeff Alfred