Copying A Section Of Another Workbook

I am creating a spreadsheet that takes data from the previous week's spreadsheet - it's a weekly report. Using vba how can I access and copy a specific range of data from one worksheet on the previous week's workbook to a range in the new week's workbook. The data in the previous week's workbook is formulas, and I'm not sure how it could affect it, but I only need the values calculated and not the formulas to be transferred. I would also prefer it if the other workbook did not open in excel, so that it happens without any changes on the screen.