Hi The following code will create 20 references of the same file into your Maya scene.
Run this in a Python tab in Maya's Script Editor.
# --
from pymel.core import *
# provide a full path to your reference file
sourceFile = r'E:\myTestReference.ma'
for x in range(20):
refNode = createReference(sourceFile, namespace='')
# refNode is a FileReference node
print 'created refNode:', repr(refNode)
# Result: FileReference(u'E:/myTestReference.ma', refnode=u'myTestReferneceRN')
# --