409334 Roberts, J. (1985). Steps to fluency: A short course in communication. Oxford : Pergamon.
Čikaški stil citiranja (17. izdanje)409334 Roberts, Jon. Steps to Fluency: A Short Course in Communication. Oxford : Pergamon, 1985.
MLA način citiranja (9. izdanje)409334 Roberts, Jon. Steps to Fluency: A Short Course in Communication. Oxford : Pergamon, 1985.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.