Cita APA (7a ed.)

Jespersen, O. (1979). Essentials of English grammar. George Allen & Unwin.

Cita Chicago Style (17a ed.)

Jespersen, Otto. Essentials of English Grammar. London [etc.]: George Allen & Unwin, 1979.

Cita MLA (9a ed.)

Jespersen, Otto. Essentials of English Grammar. George Allen & Unwin, 1979.