Cita APA (7th ed.)

Bellet. (1972). Essentials of arrhyhias. s.n.

Cita Chicago (17th ed.)

Bellet. Essentials of Arrhyhias. Philadelphia: s.n, 1972.

Cita MLA (9th ed.)

Bellet. Essentials of Arrhyhias. s.n, 1972.