Gaya APA

Tampubolon, R. (2012). Sales In You: With 20 Years Real Life Practical Experience in Selling (Cet.2). Jakarta: Gramedia Pustaka Utama.

Gaya MLA

Tampubolon, Remaja. "Sales In You: With 20 Years Real Life Practical Experience in Selling". Cet.2 Jakarta: Gramedia Pustaka Utama, 2012. Text.