Langan, J. (2005). College writing skills with readings. Boston: McGraw-Hill.
Dyfyniad Arddull ChicagoLangan, John. College Writing Skills With Readings. Boston: McGraw-Hill, 2005.
Dyfyniad MLALangan, John. College Writing Skills With Readings. Boston: McGraw-Hill, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.