APA (7th ed.) Citation

Covey, Whitman, & Normah Sir. (2010). Predictable results in unpredictable times: Sukses setiap saat. PTS Professional.

Chicago Style (17th ed.) Citation

Covey, Whitman, and Normah Sir. Predictable Results in Unpredictable Times: Sukses Setiap Saat. Batu Caves, Selangor: PTS Professional, 2010.

MLA (8th ed.) Citation

Covey, et al. Predictable Results in Unpredictable Times: Sukses Setiap Saat. PTS Professional, 2010.