HELP! My boss won't give me money!!! what to do???

HI guys, hope that you can help me. i am doing an intern in research at a new financial services company like Citigroup. it is a lot better than my last job in financial services which really suck. anyways, my company asked me to do some research on telco. i use google, but finded very little free informations, but i finded lots of reports that are exactly what my boss wants to see. the reports are very expensive but i know that the Citi can get the reports for free. so anyway, i bought the report, like 4 or 5 of them, and altogther it costed me about $8000, which is the limit to my credit card...

when i ask my boss how to get reimbursed for the money, he said that if i want to use research report, i need to use the citis online system for access. he said theres no way to file the money request. so i ask him to give me the money since he has a lot more money than me and i have none, but he said no. anyway, what can i do to get back the money????? please help me, i really need the money because right now i have none!!! i tried to tell me credit card company to give back the money, but it is citi card so they wont help me... i maybe will sue the citi, will this work???? how can i sue them but not lose my job??? please help, thanks!!!!

Mod note (Andy): Throwback Thursday - this originally went up June 2009