Committee, I. E. (1973). Fortieth report: Ministry of petroleum and chemicals (Dept. of Chemical): Fertilisers (5th Lok Sabha). Lok Sabha Secretariat.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCommittee, India. Estimates. Fortieth Report: Ministry of Petroleum and Chemicals (Dept. of Chemical): Fertilisers (5th Lok Sabha). Lok Sabha Secretariat, 1973.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCommittee, India. Estimates. Fortieth Report: Ministry of Petroleum and Chemicals (Dept. of Chemical): Fertilisers (5th Lok Sabha). Lok Sabha Secretariat, 1973.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.