standard reference for thermodynamic properties? I'm a non-chemist attempting to put together a chemistry paper. Up to now I've got my thermodynamic data from various random pdf files found on the web, together with Wikipedia. Now that the paper is nearly finished I need to replace these with values from a single, respectable source. But I've realised I don't know how to find such a source. I have a few chemistry textbooks on my desk, which tend to have tables in the back, but they're not terribly comprehensive and none of them have all the data I need.

So is there a standard resource for thermodynamic tables? I particularly need the Gibbs energy and enthalpies of formation for gases found in the atmosphere, such as $\ce{O2}$, $\ce{CO2}$, $\ce{CH4}$ and $\ce{H2O(vapour)}$?  In an ideal world this would either be something I can access online or a book that's likely to be found in my institute's rather small library.
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!