Gaya APA
J.L.Marriot, H. (1972).
Practical Electrocardiography (Fifth edtion).
United States of America:
The Williams & Wilkins Company.
Gaya MLA
J.L.Marriot, Henry.
"Practical Electrocardiography".
Fifth edtion
United States of America:
The Williams & Wilkins Company,
1972.
Lawas.