Thank you all for your replies. But the question remains unanswered.
VARK(ILS 23), OMFJ(VORX or VOR W RWT 29), VGHS (VOR RWY 32) are some charts where the VOR/NDB are not marked as the IAF.
Whereas KOBK (VOR-A), YBRM, YMAV all have IAF marked for reversals, procedure turns.