Cita APA (7th ed.)

Graybiel, A. (1952). Electrocardiography in practice. Saunders.

Cita Chicago (17th ed.)

Graybiel, Ashton. Electrocardiography in Practice. Philadelphia: Saunders, 1952.

Cita MLA (9th ed.)

Graybiel, Ashton. Electrocardiography in Practice. Saunders, 1952.