Shiva Purana
अघोरेण च मंत्रेण लिंगनिर्माणमाचरेत् । तत्पुरुषाय मंत्रेणाह्वानं कुर्याद्यथाविधि 1-20-४० ।
The phallic image shall be prepared with the Aghora॥ 55॥ mantra. The Āhvāna (invocation) shall be performed with the mantra “Tatpuruṣāya”॥ 56॥.
english translation
aghoreNa ca maMtreNa liMganirmANamAcaret । tatpuruSAya maMtreNAhvAnaM kuryAdyathAvidhi 1-20-40 ।
hk transliteration by Sanscript