Gaya APA

Hill, N., Yusuf, S. (2019). Rahasia sukses menjual ala Napoleon Hill = how to sell your way through life . Jakarta: Gramedia Pustaka Utama.

Gaya MLA

Hill, Napoleon., Yusuf, Sugiyanto. "Rahasia sukses menjual ala Napoleon Hill = how to sell your way through life". Jakarta: Gramedia Pustaka Utama, 2019. Text.