APA (7 वां संस्करण) प्रशस्ति पत्र
Walker, J., & Awange, J. L. (2018). Surveying for Civil and Mine Engineers: Theory, Workshops and Practicals. Springer.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Walker, John, और Joseph L. Awange. Surveying for Civil and Mine Engineers: Theory, Workshops and Practicals. Switzerland: Springer, 2018.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Walker, John, और Joseph L. Awange. Surveying for Civil and Mine Engineers: Theory, Workshops and Practicals. Springer, 2018.
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