APA Citation

Supriyanto. (2014). Enhance english proficiency for secretary and business people. Surabaya: Revka petra media.

Chicago Style Citation

Supriyanto. Enhance English Proficiency for Secretary and Business People. Surabaya: Revka petra media, 2014.

MLA Citation

Supriyanto. Enhance English Proficiency for Secretary and Business People. Surabaya: Revka petra media, 2014.

Warning: These citations may not always be 100% accurate.