APA

Marriott H. J., . (2002). Challenging ECGs. Philadelphia: Hanley & Belfus.

Chicago

Marriott Henry J.L, . 2002. Challenging ECGs. Philadelphia: Hanley & Belfus.

Harvard

Marriott H. J., . (2002). Challenging ECGs. Philadelphia: Hanley & Belfus.

MLA

Marriott Henry J.L, . Challenging ECGs. Philadelphia: Hanley & Belfus. 2002.