Gaya APA

Robby, L. (2011). Workbook 1 For Elementary - Intermediate Leaners of English around the World English Grammar And How To Use It (Cetakan Ke-1). Jakarta Barat: Mobile English Eplus.

Gaya MLA

Robby, Lou. "Workbook 1 For Elementary - Intermediate Leaners of English around the World English Grammar And How To Use It". Cetakan Ke-1 Jakarta Barat: Mobile English Eplus, 2011. PBI.