You can find all the required details at: http://www.cic.gc.ca/english/information/applications/prcard.asp
However, here is what CIC site says:
Additional documents of proof of residence in Canada in the past five (5) years
Include the following with your application:
Photocopies of all pages of all passports you held in the past five (5) years (if your stamps are not in English or French, please have them translated, see section on Translation of documents),
Your most recent Notice of Assessment issued by the Canada Revenue Agency within the past two (2) years. Note: You can view (and print) your tax return, as well as other personal tax information using the CRA’s My Account online service. To register or login, visit My Account.
and
A copy of one of the following:
Other Notices of Assessment issued by Canada Revenue Agency within the past five (5) years, or
transcripts from a recognized post-secondary institution in Canada verifying attendance within the past five (5) years, or
for all school-aged children, school records (such as report cards) verifying attendance within the past five (5) years.
Format: Clear and legible photocopy
