Gaya APA

Maxwell, J, C. (2011). The 21 Indispensable... (Cet.3). Surabaya: PT.Menuju Insan Cemerlang.

Gaya MLA

Maxwell, Jhon, C.. "The 21 Indispensable...". Cet.3 Surabaya: PT.Menuju Insan Cemerlang, 2011. Text.