Seeking Reliable Government Leave Rules for Private Sector Use: Where to Find Authentic Info?

I need the link/document related to government leave rules (Casual and Earned Leave) for implementing in the private sector, which cannot be challenged. The information spread around the internet does not seem authentic. I look forward to quick and accurate information.

If you are a factory, then refer to the Factories Act of 1948. If you are covered under the Shops and Establishments Act, then the Shops and Establishments Act provides detailed information on leave eligibility.