APA (7 वां संस्करण) प्रशस्ति पत्र
Singh, A., & Chowdhury, R. (1981). Soil engineering in theory and practice (2nd ed.). CBS Publication.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Singh, Alam, और R.G Chowdhury. Soil Engineering in Theory and Practice. 2nd ed. New New Delhi: CBS Publication, 1981.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Singh, Alam, और R.G Chowdhury. Soil Engineering in Theory and Practice. 2nd ed. CBS Publication, 1981.
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