Gaya APA

Covey, C, M, ., H, .. (2012). The 4 disciplines of execution . Jakarta: Dunamis Intra Sarana.

Gaya MLA

Covey, Chris, McChesney, .Jim, Huling, .Sean. "The 4 disciplines of execution". Jakarta: Dunamis Intra Sarana, 2012. Text.