Shiva Purana
महालयन्तथोंकारक्षेत्रं वै पुरुषोत्तमम् ॥ गोकर्णं भृगुकच्छं च भृगुतुंगं च पुष्करम् ॥ ४८ ॥
The great temple and the field of Omkara are also known as the Purushottama. Gokarna Bhrigukachcha Bhrigutunga and Pushkara.
english translation
mahAlayantathoMkArakSetraM vai puruSottamam ॥ gokarNaM bhRgukacchaM ca bhRgutuMgaM ca puSkaram ॥ 48 ॥
hk transliteration by Sanscript