Shiva Purana
पश्चिमाभिमुखं रौद्रं क्षेत्रपालं समर्चयेत् ॥ पञ्चमावरणं चैव सम्पूज्यानन्तरं बहिः ॥ ६८ ॥
One should worship the Raudra, the guardian of the field, facing west. After worshiping the fifth covering outside.
english translation
pazcimAbhimukhaM raudraM kSetrapAlaM samarcayet ॥ paJcamAvaraNaM caiva sampUjyAnantaraM bahiH ॥ 68 ॥
hk transliteration by Sanscript