Where on my tax return do I find individual income earned from working if I filed jointly

On a joint return everything is married up ... to separate the income look at the income forms you used to complete the return. 

Look at your own W-2's or any 1099's that reported income you received.  TurboTax does not have your W-2's or 1099's, but the worksheets that are saved as a part of the pdf will show the income(s) you entered.  Going forward--always save your W-2 's and 1099's for your own records.