Gaya APA

Sirait, C, B., Sirait, B. (2016). The Power Of Public Speaking (Cet.1). Jakarta: PT Elex Media Komputindo.

Gaya MLA

Sirait, Charles, Bonar., Sirait, Bunga. "The Power Of Public Speaking". Cet.1 Jakarta: PT Elex Media Komputindo, 2016. Text.