I've used Bibdesk to write a bibliography, and I've simply copied the cite commands into my .tex file, so I know they're right. I have at the bottom of my .tex file simply:
\bibliography{ref}
Somehow, I get an error from my .aux file:
Undefined control sequence
I.86 \citatio
Indeed, my .aux file stops writing in the middle, and the last line of it is simply
\citatio
How do I fix this?
\citatioisn't defined by plain LaTeX. I suspect there's a typo in your sources and possibly one of the packages you're using. I suggest you remove allauxfiles and remove any reference to\citatioin your sources. If recompiling then doesn't work, try to narrow down the problem. This can be done easily by copying your source to a temporary file (tmp.tex) and using the temporary file and the procedure suggested in the answers to this question. – Aug 20 '15 at 05:07auxfile in the middle of the string\citation. We really need to know more about what you're doing. Could you maybe construct a minimal (non-)working example (MWE)? – yo' Aug 20 '15 at 07:25