Gaya APA

al., C, P, S, E. (1982). Monitoring heart rhytmn. -- 2nd ed. . New York: Delmar Pub. Inc.

Gaya MLA

al., Charles, P., Summerall,, Et.. "Monitoring heart rhytmn. -- 2nd ed.". New York: Delmar Pub. Inc, 1982. Text.