APA (7th ed.) Citation

Mak Koon Hou & Zhang, L. (2011). Your heart matters. Armour Publishing Pte Ltd.

Chicago Style (17th ed.) Citation

Mak Koon Hou and Loiusa Zhang. Your Heart Matters. Singapore: Armour Publishing Pte Ltd, 2011.

MLA (9th ed.) Citation

Mak Koon Hou and Loiusa Zhang. Your Heart Matters. Armour Publishing Pte Ltd, 2011.

Warning: These citations may not always be 100% accurate.