Garudapurana 1.33.16.p1

1.33.16.p1

iti śrīgāruḍe mahāpurāṇe pūrvakhaṇḍe prathamāṃśākhye ācārakāṇḍe sudarśanapūjāvidhirnāma trayastriṃśo 'dhyāyaḥ

Thus in the glorious Garuḍa Mahāpurāṇa, in the first section called the first part, in the section on conduct, the thirty-third chapter entitled ‘The Rule for the Worship of Sudarśana’.