What is the best way to: Refer to a specific page in a book or magazine quickly.

Choices:
I. Take a magic marker and make an x or other mark on the page that you will need later. The book or magazine can be closed with no harm and the page is now easy to find..
II. Take a gem style paperclip and put it on the page that you will need later. The book or magazine can be closed with no harm and the page is now easy to find..
Answer:
II.