Gaya APA

BARRACLOUGH, S. (2008). THE CIRCULATORY SYSTEM: WHY DOES MY HEART BEAT? . INGGRIS: Heinemann Library.

Gaya MLA

BARRACLOUGH, SUE. "THE CIRCULATORY SYSTEM: WHY DOES MY HEART BEAT?". INGGRIS: Heinemann Library, 2008. Text.