LEFFINGWELL RICHARD. (2019). BASIC MATH SUBTRACTING & TAKING AWAY (2018 Ed.). HEINEMANN LIBRARY.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLEFFINGWELL RICHARD. BASIC MATH SUBTRACTING & TAKING AWAY. 2018 Ed. MINNESOTA: HEINEMANN LIBRARY, 2019.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLEFFINGWELL RICHARD. BASIC MATH SUBTRACTING & TAKING AWAY. 2018 Ed. HEINEMANN LIBRARY, 2019.
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