APA Style

Covey, S, R. (2020). The 7 Habits Of Highly Effective People (Cetakan 20 Tahun 2020). New York: simon & schuster publishing.

MLA Style

Covey, Sthephen, R.. "The 7 Habits Of Highly Effective People". Cetakan 20 Tahun 2020 New York: simon & schuster publishing, 2020. Text.