APA (7th ed.) Citation

Jespersen, O. (1933). Essentials of english grammar. George Allen & Unwin.

Chicago Style (17th ed.) Citation

Jespersen, Otto. Essentials of English Grammar. Londres: George Allen & Unwin, 1933.

MLA (9th ed.) Citation

Jespersen, Otto. Essentials of English Grammar. George Allen & Unwin, 1933.