Cita APA (7th ed.)
Hight, D. W. (1966). A concept of limits (1a. ed.). Prentice Hall.
Cita Chicago (17th ed.)
Hight, Donald W. A Concept of Limits. 1a. ed. Prentice Hall, 1966.
Cita MLA (9th ed.)
Hight, Donald W. A Concept of Limits. 1a. ed. Prentice Hall, 1966.
Atenció: Aquestes cites poden no estar 100% correctes.