References

BhPr, 1, 8, 88.1
  kṣetrabhedena vijñeyaṃ śivavīryaṃ caturvidham /Context
BhPr, 1, 8, 116.1
  viprakṣatriyaviṭśūdrabhedāt tatsyāccaturvidham /Context
BhPr, 1, 8, 165.2
  tattu pāṣāṇabhedo'sti muktādi ca taducyate //Context