Shiva Purana
प्रवेशयामि शब्दान्ते सुवरोमित्युदीरयेत्॥ त्रिपादमुच्चरेत्पूर्वं सावित्रीमित्यतः परम् ॥ ५०॥
At the end of the word I introduce you should say Suvaro. One should chant the three-footed mantra first and then Savitri.
english translation
pravezayAmi zabdAnte suvaromityudIrayet॥ tripAdamuccaretpUrvaM sAvitrImityataH param ॥ 50॥
hk transliteration by Sanscript