From the pages of ஸ்ரீ நியம க்ஷேத்திர மாஹாத்ம்யம் , compiled by Sri S.V. Radhakrishna Sastrigal(Sri Rangam) - Published by Mathangi Publication (Trichy)
Slokas are found in Brhammanda Puranam - Brhummothram Kaandam.
Abridged version of slokas with details published (அத்தியாயம் 2) here and rest of the series will be published continuously in this section!!!