APA (7th ed.) Citation

Hill, Mohd Nasir Khalid, & Muthla Yusoff. (2007). Tangga kecemerlangan. Napoleon Hill Associates.

Chicago Style (17th ed.) Citation

Hill, Mohd Nasir Khalid, and Muthla Yusoff. Tangga Kecemerlangan. Kuala Lumpur: Napoleon Hill Associates, 2007.

MLA (8th ed.) Citation

Hill, et al. Tangga Kecemerlangan. Napoleon Hill Associates, 2007.