Columbia subject headings:
Upanishads. Br̥hadāraṇyakopaniṣad. Chapter 3-4--Criticism, interpretation, etc.
Yājñavalkya--Criticism and interpretation.
Harvard subject headings:
Upanishads. Bṛhadāraṇyakopaniṣad. Chapter 3-4--Criticism, interpretation, etc.
Yājñavalkya--Criticism and interpretation.
Princeton subject headings: