Hart, W. L. R. (1971). Preparation for calculus. Intext Educational Publishers.
Cita Chicago (17th ed.)Hart, William Le Roy. Preparation for Calculus. Scranton: Intext Educational Publishers, 1971.
Cita MLA (9th ed.)Hart, William Le Roy. Preparation for Calculus. Intext Educational Publishers, 1971.
Atenció: Aquestes cites poden no estar 100% correctes.