Gaya APA

Sirait, C, B, S, B. (2015). Public speaking and business: etika berbicara dalam forum bisnis . Jakarta: Jakarta : PT. Elex Media Komputindo, 2015.

Gaya MLA

Sirait, Charles, Bonar, Sirait,, Bunga. "Public speaking and business: etika berbicara dalam forum bisnis". Jakarta: Jakarta : PT. Elex Media Komputindo, 2015, 2015. Ebook.