Cita APA

Helliwell, C. H., & Helliwell, C. H. (1935). Fundamentals of college mathematics. New York, New York: Macmillan.

Citación estilo Chicago

Helliwell, Charles Harold, y Charles Harold Helliwell. Fundamentals of College Mathematics. New York, New York: Macmillan, 1935.

Cita MLA

Helliwell, Charles Harold, y Charles Harold Helliwell. Fundamentals of College Mathematics. New York, New York: Macmillan, 1935.