Agnipurana 143.4

143.4

tato guhyakruñjikāstraṃ maṇḍale sthānake yajet /
agnau kūrcaśiro rudre nairṛtye 'tha śikhānile //

Then one should worship the secret weapon of Kubjikā in its place in the maṇḍala: / the heart-kūrca in the south-east, the head in the north-east, the crest in the south-west, [and the armour] in the north-west;