J E Pin. (1986). Varities of formal languages. North Oxford Academic Publishers.
Dyfyniad Arddull ChicagoJ E Pin. Varities of Formal Languages. North Oxford Academic Publishers, 1986.
Dyfyniad MLAJ E Pin. Varities of Formal Languages. North Oxford Academic Publishers, 1986.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.