Nick Ham. (1999). Longman essential activator (Workbook). Essex, UK: Longman.
Dyfyniad Arddull ChicagoNick Ham. Longman Essential Activator (Workbook). Essex, UK: Longman, 1999.
Dyfyniad MLANick Ham. Longman Essential Activator (Workbook). Essex, UK: Longman, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.