Jespersen, O. (1933). Essentials of english grammar. George Allen & Unwin.
Cita Chicago (17th ed.)Jespersen, Otto. Essentials of English Grammar. Londres: George Allen & Unwin, 1933.
Cita MLA (9th ed.)Jespersen, Otto. Essentials of English Grammar. George Allen & Unwin, 1933.
Atenció: Aquestes cites poden no estar 100% correctes.