One of the famous stories from the Ramcharitmanas is the story of Kaka Bhusundi. This brahmin Bhusundi was a devotee of Rama was cursed by sage Lomasa to become a crow. After knowing that he was an ardent devotee of Sri Rama, the sage diluted the curse and gave him the knowledge. By this knowledge, this crow has lived through the kalpas and seen different outcomes of Ramayana and Mahabharata.
However this story doesn't appear in the Vālmiki Rāmāyaṇa. I know that this story is also present in Yoga-Vāsiṣṭha which is also known as Vaśiṣṭa Rāmāyaṇa. I'm looking for sources other than this text.
So, my question is from which purana or scripture did Goswami Tulsidas know the story of Kaka Bhusundi?