Shiva Purana
अग्रतो वीरभद्रं च पृष्ठे कीर्तिमुखं तथा । तत एकादशान्रुद्रा न्पूजयेद्विधिना ततः 1-21-५० ।
Vīrabhadra in front and Kīrtimukha at the back. Then he shall worship eleven Rudras.
english translation
agrato vIrabhadraM ca pRSThe kIrtimukhaM tathA । tata ekAdazAnrudrA npUjayedvidhinA tataH 1-21-50 ।
hk transliteration by Sanscript