Shiva Purana
भुवनान्यन्तरण्डस्य ततो ब्रह्माण्डकोटयः ॥ बहिरंडान्यसंख्यानि भुवनानि सहाधिपैः ॥ ७४ ॥
Then there are the millions of universes within the universe. There were countless other eggs outside the worlds with their rulers.
english translation
bhuvanAnyantaraNDasya tato brahmANDakoTayaH ॥ bahiraMDAnyasaMkhyAni bhuvanAni sahAdhipaiH ॥ 74 ॥
hk transliteration by Sanscript