move data from multiple worksheets to single sheet whithout manually entering each cell id

I have a number of worksheets and need to move data from the same cells of each work sheet to a summary worksheet. I manually entered the cell id's for the first sheet.
example =Jan!M6, =Jan!N7, =Jan!O9 etc. I know I should be able to automatically enter these same cells for the remainder of my worksheets with out mannualy going in and typing each one (there are a lot of entries.) But for the life of me I just can not remember how to do it. The next sheet is named "Feb" and "Mar" etc.

Can anyone point me in the right direction before I start typing????

Hi
,I do not think I explained my self. I am attaching the test workbook (I hope- first try). I need the Jan references in the totals sheet to be duplicated for all the other months. I know I can type and go thru and replace etc but I also know there has to be a better and more professional way to do it! thank you in advance.

Wow, Thank you. I think I understand it. I have been reading about the indirect function but I need to do some more reading on it. I really appreciate your help.
Joan