Which sentences are ok (please consider "to" and without "to" forms and tenses)
I like refering to this book
I like to refer to this book
You have to refer to me with respect
You have to refer me with respect
This document is regarding important topic
This document is regarding to important topic
This document regards important topic
This document regards to important topic
NOW (somebody says) This question is regarding to important topic
NOW (somebody says) This question is regarding important topic