ARNOLD, T. K. BASIC ENGLISH GRAMMAR FOR SCHOOLS.
Cita Chicago (17th ed.)ARNOLD, THOMAS. KURCHEVER. BASIC ENGLISH GRAMMAR FOR SCHOOLS.
Cita MLA (9th ed.)ARNOLD, THOMAS. KURCHEVER. BASIC ENGLISH GRAMMAR FOR SCHOOLS.
Atenció: Aquestes cites poden no estar 100% correctes.