I have a Excel project with some user forms and sheets.
I want get values from different sheets cells and user form elements. It has many sets of these values and the user must have the possibility to change easy the source of data.
For these reason I have a sheet where are located these parameters.
I want a code to get data from a cell or a user form element, whose address is this sheet.
For ex.

In right is an other reference to cells, where a1 is a second sheet

with these function
Function referinta(s1 As String, s2 As String)
Dim R1 As Range
Set R1 = Sheets(s1).Cells.Range(s2):
referinta = R1.Value
End Function
we have the value of the cells described with these two parameters s1, s2, where s1 is the sheet name, s2 the cell location
I want in the similar way get the values from an user form elements, like userfom.textbox1 and a cell reference like a.cells(i,j) & " " & a.cells(i1,j1)
link to the file
https://drive.google.com/open?id=0B16Q4Z9FkFzhOUh4eGlYVUMwZnM