Skandapurana 2.4.2.p107

2.4.2.p107

śāligrāmaśilādānaṃ kartavyaṃ nā'tra saṃśayaḥ .. 56 .. *
iti śrīskāṃde mahāpurāṇa ekāśīti sāhasryāṃ saṃhitāyāṃ dvitīye vaiṣṇavakhaṇḍe kārtikamāsamāhātmye kārtikavratadharmanirūpaṇaṃnāma dvitīyo'dhyāyaḥ .. 2 ..

the gift of a śālagrāma stone should be performed; there is no doubt in this. (56)
Thus in the glorious Skanda Purāṇa, in the compendium of eighty-one thousand [verses], in the second Vaiṣṇava section, in the Greatness of the Month of Kārtika, the second chapter named “Description of the Rules of the Kārtika Observance.” (2)