Ask your friend for the styles and copy them in the styles directory. Word 2010 styles can be used in Word 2007 without any problem.
In case your friend (or someone else) can't give them to you, you could follow the step-by-step tutorial I gave in the Word forums to do it yourself (check the hard way) at http://answers.microsoft.com/en-us/office/forum/office_2007-word/apa-6th-edition-and-mla-7th-edition-in-office-2007/7ec9a800-b406-4a04-b257-c2d7d64f5fc3
In case your friend (or someone else) can't give them to you, you could follow the step-by-step tutorial I gave in the Word forums to do it yourself (check the hard way) at http://answers.microsoft.com/en-us/office/forum/office_2007-word/apa-6th-edition-and-mla-7th-edition-in-office-2007/7ec9a800-b406-4a04-b257-c2d7d64f5fc3