Wheater, C. (2019). Easy pre-calculus step-by-step: Master high-frequency concepts and skills for precalc proficiency--fast! (Second edition.). McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWheater, Carolyn. Easy Pre-calculus Step-by-step: Master High-frequency Concepts and Skills for Precalc Proficiency--fast! Second edition. New York: McGraw-Hill, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWheater, Carolyn. Easy Pre-calculus Step-by-step: Master High-frequency Concepts and Skills for Precalc Proficiency--fast! Second edition. McGraw-Hill, 2019.
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