The advance learner's dictionary of current english de A. S. Hornby - E. V. Gatenby - H. Wakefield
Libro usado (Castellano) (Inglés)
A direct method english course - Book I de E. V. Gatenby
A direct method english course - Book II de E. V. Gatenby
Absorbing english - Book 3 de James Hemming - E. V. Gatenby