Shiva Purana
वामदेवमतेनापि शौनकादिमतेन वा ॥ तत्र मुख्यं वामदेव्यं गर्भयुक्तो यतो मुनिः ॥ ५४॥
The procedure may follow the opinion of Vāmadeva or of Sanaka and others. But the important one is that of Vāmadeva because he was a liberated soul even while he was in the womb.
english translation
vAmadevamatenApi zaunakAdimatena vA ॥ tatra mukhyaM vAmadevyaM garbhayukto yato muniH ॥ 54॥
hk transliteration by Sanscript