Cita APA (7th ed.)

Hardy, F. L. (1971). Precalculus mathematics (2a. ed.). Charles E. Merrill.

Cita Chicago (17th ed.)

Hardy, F. Lane. Precalculus Mathematics. 2a. ed. Columbus: Charles E. Merrill, 1971.

Cita MLA (9th ed.)

Hardy, F. Lane. Precalculus Mathematics. 2a. ed. Charles E. Merrill, 1971.