The Spiritual Nectar of Deity Abhishekam
The Sacred Basil Beloved of Lord Vishnu
The katha from the Brahma Vaivarta Purana in which Krishna tells Yudhishthira how worshipping Vishnu with Tulsi on Kamika Ekadashi cleanses an accidental sin.
The Tulasi Upanishad, a short Vaishnava text that includes the verse 'Yanmule sarva-tirthani', honoring holy basil as the beloved of Vishnu.