Shiva Purana
करन्यासाद्यमपि तैः कृत्वा वाथ न वा क्रमात् ॥ शिरोवदनहृद्गुह्यपादेष्वेतानि कल्पयेत् ॥ ३१ ॥
The Karanyāsa may or may not be performed through them. The Brahmans shall be fixed in the head, face, chest, private parts and legs.
english translation
karanyAsAdyamapi taiH kRtvA vAtha na vA kramAt ॥ zirovadanahRdguhyapAdeSvetAni kalpayet ॥ 31 ॥
hk transliteration by Sanscript