KIMBROUGH, V. F., & VAI, M. (1991). English on call level one. McGraw-hill.
Dyfyniad Arddull ChicagoKIMBROUGH, Victoria F., and Marjorie VAI. English on Call Level One. New York: McGraw-hill, 1991.
Dyfyniad MLAKIMBROUGH, Victoria F., and Marjorie VAI. English on Call Level One. McGraw-hill, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.