Shiva Purana
पृष्ठे चैवं प्रतिष्ठाय यजेत्तत्राश्विदैवते १०४ब्। शिवशक्तिं तथा रुद्र मीशं नारदमेव च १०४ ।
On the back, thus placing the worship, one should perform the yajna (sacrifice) there, invoking the deities of the horse (Ashvadeva), along with the power of Shiva, Rudra, the Lord (Isha), and Narada himself.
english translation
pRSThe caivaM pratiSThAya yajettatrAzvidaivate 104b। zivazaktiM tathA rudra mIzaM nAradameva ca 104 ।
hk transliteration by Sanscript