when to use future in if-clause?

English as a Second Language English for Beginners
1

Could you please give me reference(s) explaining the use of future in if-clause (if+will)?

I asked it already in this “if + future” thread but was banned (without any warning and explanation) getting inconclusive response

2

References? practical English grammar. Will in conditional sentences may show willingness.

3

Could you give the reference (title, name of authors) or link to it?

4

The authors are Thomson and Martinet. Look up in index for if.

5

Sorry. You said as if it were only used that way. Take notice to your grammar please