Shiva Purana
रामेश्वरावतारस्तु शिवस्यैकादशः स्मृतः ॥ रामचन्द्रप्रियकरो रामसंस्थापितो मुने ॥ ४६॥
O sage, the incarnation of Śiva is the eleventh one. It was pleasing to Rāma and it was installed by him.
english translation
rAmezvarAvatArastu zivasyaikAdazaH smRtaH ॥ rAmacandrapriyakaro rAmasaMsthApito mune ॥ 46॥
hk transliteration by Sanscript