Q. I need help with finding secondary sources on Maya Angelou's "Still I Rise".

That is a tough one. It appears that this work has not been written about in great depth. That is not uncommon with contemporary writers. There are some articles in:

• Literary Reference Center
• Literary Sources.
• Gale eBooks Poetry for Students.

You should consult with your instructor to see if these are sufficient or you might think about changing to a work about which more has been written.