Wheater, C. (2019). Easy pre-calculus step-by-step: Master high-frequency concepts and skills for precalc proficiency--fast! (Second edition.). McGraw-Hill.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Wheater, Carolyn. Easy Pre-calculus Step-by-step: Master High-frequency Concepts and Skills for Precalc Proficiency--fast! Second edition. New York: McGraw-Hill, 2019.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Wheater, Carolyn. Easy Pre-calculus Step-by-step: Master High-frequency Concepts and Skills for Precalc Proficiency--fast! Second edition. McGraw-Hill, 2019.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.