For a general coverage, I suggest you combine two authors. Firstly, look for the LL Book by Dr. PK Padhi. For specific precedents and forms, refer to Mr. S. D. Puri's book titled "Labour Management Forms & Precedents Law Practice & Procedure." The coverage found in these two books combined is pinpoint perfect and serves best in terms of effectiveness for regular reference. Below, I am providing the link to SD Puri's dedicated website. You may encounter some difficulty in obtaining a hard copy of his book, as it is rare these days.
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Cheers & Happy Knowledge Hunting :-)