Garudapurana 2.26.44

2.26.44

ekādaśe vṛṣotsargaṃ pretaśrāddhāni ṣoḍaśa /
ghaṭādipadadānāni mahādānāni yāni ca /
varṣaṃ yāvatpṛthakkuryātpretastṛptiṃ vrajecciram //

On the eleventh day, the release of the bull, the sixteen preta-śrāddhas, / the gifts of vessels and steps, and the great gifts— / he should perform them separately for a year, so that the ghost attains satisfaction for a long time.