按照checklist上的要求:
"If you are employed, an orginal of a letter from your current employer stating your period of employment, salary and regualor hours per week. If you have an co-signer and he or she is employed, include a similar letter from his or her employer. If you and, if applicable, your co-signer are the sole owners of or are partners in an unincorporated business, provide evidence of self-employment income (statement of business activities) over the 12 months preceding the date of your sponsorship application. If you and, if applicable, your co-signer received interest...."