Shiva Purana
तत्राकारः श्रितो भागे ज्वलल्लिंगस्य दक्षिणे ॥ उकारश्चोत्तरे तद्वन्मकारस्तस्य मध्यतः ॥ ४ ॥
The letter ‘a’ attached itself to the southern side of the blazing Liṅga, the letter “u” to the north and the letter “ma” to its middle.
english translation
tatrAkAraH zrito bhAge jvalalliMgasya dakSiNe ॥ ukArazcottare tadvanmakArastasya madhyataH ॥ 4 ॥
hk transliteration by Sanscript