Shiva Purana
द्वितीयावरणे पूज्याश्चतस्रो मूर्तयः क्रमात् ॥ पूर्वाद्युत्तरपर्यंताः शक्तयश्च ततः परम् ॥ २८ ॥
The four shall be worshipped in the second Āvaraṇa in order from the east to the north and their Śaktis afterwards.
english translation
dvitIyAvaraNe pUjyAzcatasro mUrtayaH kramAt ॥ pUrvAdyuttaraparyaMtAH zaktayazca tataH param ॥ 28 ॥
hk transliteration by Sanscript