Shiva Purana
महाकालस्योत्तरतः पिंगलं तु समर्चयेत् ॥ शास्तृमातृसमूहस्य मध्ये भृंगीश्वरं ततः ॥ १९ ॥
He shall worship Piṅgala to the north of Mahākāla. Then he shall worship Bhrṅgīśvara in the middle of Śāstra and Mātṛ group.
english translation
mahAkAlasyottarataH piMgalaM tu samarcayet ॥ zAstRmAtRsamUhasya madhye bhRMgIzvaraM tataH ॥ 19 ॥
hk transliteration by Sanscript