The story of Guru Nanak's life has been expanded at length in the:

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The janam-sakhis are the traditional biographies of Guru Nanak and contain detailed accounts of his life, teachings, and travels. They are considered the most authoritative sources on his life and are revered by Sikh scholars and followers. The Puranas are Hindu texts that primarily focus on mythology, while the hukamnama is a holy order or command issued by the Guru or the Sikh scripture, not a historical account of Guru Nanak's life. The Bhagavad Gita is a Hindu scripture focused on philosophical and spiritual teachings, not a biography of Guru Nanak. Janam-sakhis are traditional Sikh texts that provide detailed accounts of the life of Guru Nanak, the founder of the Sikh faith. These texts are considered to be authoritative sources of information about Guru Nanak's life and teachings. The Puranas are a different set of texts in Hinduism, while the hukamnama is a daily message of the day received by a Sikh. The Bhagavad Gita is a Hindu scripture that is considered to be a guide for living a good life.

The Story of Guru Nanak's Life Has Been Expanded at Length