Gaya APA

Gray, M., Rahardjo, S. (2008). Ringkasan Padat - Seven Habits of Highly Effective People - Stephen R Covey (Revisi 1). Yogyakarta: Takasitau.

Gaya MLA

Gray, Michael., Rahardjo, Sumargi. "Ringkasan Padat - Seven Habits of Highly Effective People - Stephen R Covey". Revisi 1 Yogyakarta: Takasitau, 2008. Text.