While using Sp service get operation not getting data of column Created by And Modified By

Hi,

I am using get operation and getting all columns data but not getting 'created by'  and 'modified by'  fields data,can anyone help me in this?

$().SPServices({
operation: method,
async: false,                  
listName: list,

CAMLQuery: query,
completefunc: function (xData, Status) { 
console.log(xData.responseText)

                }
        });

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Vishal Goyal