Gaya APA

Beasley, J, W., Wayne, I, G, E. (NULL). Guide to basic electrocardiography . New: New York: Plenum Medical Book Company; 1990.

Gaya MLA

Beasley, John, Wagner., Wayne, I., Grogan,, E.. "Guide to basic electrocardiography". New: New York: Plenum Medical Book Company; 1990, NULL. Text.