Gaya APA

HEARTSILL, W. (2008). THE MIRACLE OF POSITIF THINKING = MUKJIZAT BERPIKIR POSITIF . YOGYAKARTA: QUILLS.

Gaya MLA

HEARTSILL, W.. "THE MIRACLE OF POSITIF THINKING = MUKJIZAT BERPIKIR POSITIF". YOGYAKARTA: QUILLS, 2008. Text.