Emery, D. W., & Pence, R. W. A grammar of present-day english (2a ed.).
Cita Chicago (17th ed.)Emery, D. W., i R. W. Pence. A Grammar of Present-day English. 2a ed.
Cita MLA (8th ed.)Emery, D. W., i R. W. Pence. A Grammar of Present-day English. 2a ed.
Atenció: Aquestes cites poden no estar 100% correctes.