Gaya APA

Lucantoni, P., Kellas, L. (2018). Cambridge IGCSE: English as a Second Language Workbook Fifth Edition (fifth edition). New York, USA: Cambridge University Press.

Gaya MLA

Lucantoni, Peter., Kellas, Lydia. "Cambridge IGCSE: English as a Second Language Workbook Fifth Edition". fifth edition New York, USA: Cambridge University Press, 2018. Text.