Opening a workbook as read-only through VBA code

Hi, I am using the following code to open another workbook, and eventually do some copy/pasting into the workbook housing the VBA code. However, I need to able to open the workbook as a read only. Can I modify the following code to achieve that?
' Get source workbook...

    Dim filter As String
    Dim caption As String
    Dim sourceFilename As String
    Dim sourceWorkbook As Workbook
    Dim targetWorkbook As Workbook

    ' make weak assumption that active workbook is the target
    Set targetWorkbook = Application.ActiveWorkbook

    ' get the source workbook
    filter = "Excel Workbooks (*.xlsx; *.xlsm),*.xlsx;*.xslm"
    caption = "Please Select an input file with the RDT."

    sourceFilename = Application.GetOpenFilename(filter, , caption)

    Set sourceWorkbook = Application.Workbooks.Open(sourceFilename)

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Dmitriy KritskiyAsked:
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NorieAnalyst Assistant Commented:
Try this.
Set sourceWorkbook = Application.Workbooks.Open(sourceFilename, ReadOnly:=True)

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