Gaya APA

Maxwell, J, C. (2014). The 21 Indispensable Qualities Of A Leader . Surabaya: PT. Menuju Insan Cemerlang.

Gaya MLA

Maxwell, John, C.. "The 21 Indispensable Qualities Of A Leader". Surabaya: PT. Menuju Insan Cemerlang, 2014. Text.