Skandapurana 1.4.11.152

1.4.11.152

kāśajaṃ vasavo liṃgaṃ svayaṃbhumiti nāma ca..
trilohaṃ mātaro liṃgaṃ nāma bhūteśameva ca.. 13.152 ..

the Vasus, a bronze liṅga, and the name “Svayambhu”;
the Mothers, a liṅga of three metals, and the name “Lord of Spirits”;