standard reference for thermodynamic properties?
A reference that I've used quite a lot (as a student) is SI Chemical Data, which I guess is quite common. It should contain the data you ask for, among other things. 

If you are looking for an online source, the NIST-JANAF Thermochemical Tables or NIST Chemistry WebBook should be good places to start. I think both should be respectable enough. The Chemistry WebBook might be a bit more comprehensive, but I suspect that much of the data is from the same source anyway, since NIST is behind both services. 

Hope you can use one or the other!