Shiva Purana
अथवा द्वादशादित्या द्वितीयावरणे यजेत् ॥ तृतीयावरणे चैव राशीन्द्वादश पूजयेत् ॥ ३४ ॥
Or one may worship the twelve suns in the second covering. In the third covering one should worship the twelve signs.
english translation
athavA dvAdazAdityA dvitIyAvaraNe yajet ॥ tRtIyAvaraNe caiva rAzIndvAdaza pUjayet ॥ 34 ॥
hk transliteration by Sanscript