Shiva Purana
इति संस्थापयेल्लिंगं साक्षाच्छिवपदप्रदम् । अथवा चरलिंगं तु षोडशैरुपचारकैः २५ ।
The devotee shall install the phallic emblem and it will accord directly the region of Śiva. Or the devotee shall worship the mobile emblem with the sixteen types of homage and services as prescribed.
english translation
iti saMsthApayelliMgaM sAkSAcchivapadapradam । athavA caraliMgaM tu SoDazairupacArakaiH 25 ।
hk transliteration by Sanscript