Iqbal Fahreen Hamdan. (2010). Usaha murni. Zufad Enterprise.
Cita Chicago (17th ed.)Iqbal Fahreen Hamdan. Usaha Murni. Selangor: Zufad Enterprise, 2010.
Cita MLA (8th ed.)Iqbal Fahreen Hamdan. Usaha Murni. Zufad Enterprise, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.